2.3 Chemistry Plus

CHEMISTRY PLUS cwigvYMZ imvqb 375 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES SURVEY TABLE wK coe? †Kb coe? †Kv_v n‡Z coe? KZUzKz coe? CONCEPT No. MAGNETIC TOPICS [hv co‡e] MAKING DECISION [†h Kvi‡b co‡e] VVI For This Year DU GU M & D S & T Engr. HSC WRITTEN MCQ CONCEPT-01 †h․‡Mi fi, KYv I ms‡KZ welqK MYbv - 25% 50% 25% - 50% * ** CONCEPT-02 Zzj¨ msL¨v Ges A¤øZ¡-ÿviKZ¡ wbY©q - 25% 50% 25% - 50% * ** CONCEPT-03 mgxKiY wfwËK ivmvqwbK MYbv 25% 50% - 50% 50% 50% ** ** CONCEPT-04 `ªe‡Yi NbgvÎv cÖKv‡ki c×wZmg~n 50% 75% 90% - 50% 75% * *** CONCEPT-05 imvq‡bi ÿz`ªvwZÿz`ª GKK I GK‡Ki iƒcvšÍi 75% 50% 50% 75% 75% 50% * ** CONCEPT-06 c¨v_jwRK¨vj GK‡Ki iæcvšÍi m¤úwK©Z cÖ‡qvM - 50% 50% - - 50% * * CONCEPT-07 UvB‡Uªkb I ÷¨vÛvW© c`v_© Ges Av‡qv‡WvwgwZ-Av‡qvwWwgwZ 30% 75% 75% 50% - 75% ** ** CONCEPT-08 wb‡`©kK I wb‡`©kK wbev©Pb 25% 75% 75% 50% - 75% * *** CONCEPT-09 ‡gvj msL¨v m¤úwK©Z mgm¨v 90% 75% 50% 75% 75% 75% *** ** CONCEPT-10 ‡gvj msL¨v I Zzj¨ msL¨vi MvwYwZK cÖ‡qvM 75% 75% 50% 75% 75% 75% *** ** CONCEPT-11 RviY-weRvi‡Yi wewfbœ gZev` 50% 50% 75% 50% - 50% ** ** CONCEPT-12 RviY msL¨v I ‡hvRbx m¤cwK©Z Z_¨vejx 75% 75% 75% 75% 75% 75% *** *** CONCEPT-13 RviY-weRviY wewµqv mgZvKiY I †gvj msL¨vi AbycvZ 50% 50% 25% 50% 75% 50% *** ** CONCEPT-14 `ªe‡Y NbgvÎv wbY©‡q weqvi j¨v¤^vU© m~Î 25% - 50% - - 75% *** * CONCEPT-15 Atomic Absorption, UV–spectroscopy, HPLC I GC - 50% 75% 50% - 75% *** ** BASIC TOUCH AT A GLANCE ¸iæZ¡c~Y© k㸇”Qi cwiwPwZ I cÖ‡qvM [TOPICS Gi ¸iæZ¡vbymv‡i] kã cwiwPwZ I cÖ‡qvM GK †gvj ‡Kv‡bv Dcv`v‡bi hZ MÖvg f‡i 6.0231023 wU AYy, cigvYy ev Avqb _v‡K, ZZ MÖvg fi‡K H Dcv`v‡bi GK †gvj ejv n‡q _v‡K| ‡gvjvi `ªeY ‡Kv‡bv wbw`©ó ZvcgvÎvq `ªe‡Yi cÖwZ wjUvi AvqZ‡b GK †gvj `ªe `ªexf~Z _vK‡j G `ªeY‡K H `ª‡ei †gvjvi `ªeY e‡j| ppm cÖwZ wjUvi `ªe‡Y H `ª‡ei KZ wgwj MÖvg `ªe `ªexf~Z Ae¯
vq Av‡Q `ª‡ei H cwigvYB H `ªe‡Yi ppm NbgvÎv| Ab¨fv‡eI G‡K cÖKvk Kiv hvq| cÖwZ wgwjwjUvi `ªe‡Y H `ª‡ei KZ gvB‡µvMÖvg (g) `ªe `ªexf~Z Av‡Q Zvi msL¨vgvbB H `ªe‡Yi ppm gvÎv| bgybv `ªeY AÁvZ NbgvÎvi `ªeYB bgybv `ªeY| cÖvBgvwi ÷¨vÛvW© c`v_© †h mKj c`v_© ev Zvi `ªeY‡K `xN©w`b †i‡L w`‡jI `ªe‡Yi NbgvÎvi †Kvb cwieZ©b N‡U bv| ‡m‡KÛvix ÷¨vÛvW© c`v_© †h mKj c`v_© ev Zvi `ªe‡Yi NbgvÎv mg‡qi mv‡_ mv‡_ cwiewZ©Z n‡q hvq| RviY-weRviY wewµqv B‡jKUª‡bi `vb I MÖn‡Yi gva¨‡g †h wewµqv N‡U Zv‡K RviY-weRviY wewµqv e‡j| RviK c`v_© B‡jKUªb MÖnY K‡i Ges weRviK c`v_© B‡jKUªb `vb K‡i| `k©K Avqb RviY-weRviY wewµqvq †hme Avq‡bi RviY msL¨v AcwiewZ©Z _v‡K, Zv‡`i‡K `k©K Avqb e‡j| weqvi j¨v¤^vU© m~Î ‡Kvb `ªe‡Yi ga¨ w`‡q GKeY©x Av‡jv cÖevwnZ Ki‡j AvcwZZ Av‡jvK iwk¥i ZxeªZvi n«vm `ªe‡Yi cyiæ‡Z¡i I `ªe‡Yi NbgvÎvi mgvbycvwZK| MÖvg AvYweK fi ‡Kvb †g․wjK ev †h․wMK c`v‡_©i AvYweK fi‡K MÖv‡g cÖKvk Ki‡j MÖv‡g cÖKvwkZ fi‡K H †g․wjK ev †h․wMK c`v‡_©i MÖvg AvYweK fi ev †gvj ejv nq| †hgbt HCl Gi AvYweK fi = 36.5 Ges 36.5g HCl †K ejv nq GK †gvj| jkwgU msL¨v cÖgvY ZvcgvÎv I Pv‡c A_©vr 0C ZvcgvÎv I 1 atm Pv‡c 1 cm3 AvqZ‡bi M¨v‡m we`¨gvb AYy msL¨v‡K jkwgU msL¨v e‡j| GB msL¨v‡K n Øviv m~wPZ Kiv nq| N.T.P.-‡Z N I n-Gi g‡a¨ m¤úK© wb¤œiƒc- N = 22400 n ‡gvjvi AvqZb ‡Kvb c`v‡_©i MÖvg AvYweK fi ev MÖvg †gvj ev 1 †gvj wbw`©ó ZvcgvÎvq †h AvqZb `Lj K‡i Zv‡K †gvjvi AvqZb e‡j| ‡gvjvwiwU wbw`©ó ZvcgvÎvq †Kvb `ªe‡Yi cÖwZ wjUvi ev cÖwZ Nb †Wwm wg AvqZ‡b ev 1000cm3 AvqZ‡b `ªexf~Z `ª‡ei †gvj msL¨v‡K ev MÖvg AvYweK fi‡K H `ªe‡Yi †gvjvwiwU e‡j| ‡gvjvwjwU ‡Kvb `ªe‡Yi cÖwZ 1000 MÖvg `ªve‡K `ªexf~Z `ª‡ei †gvj msL¨v‡K H `ªe‡Y `ª‡ei †gvjvwjwU e‡j| cÖgvY `ªeY UvB‡Uªkb cÖwµqvi Rb¨ †h `ªe‡Yi NbgvÎv Rvbv _v‡K Zv‡K cÖgvY `ªeY e‡j| UvB‡Uªkb Dchy³ wb‡`©k‡Ki Dcw¯
wZ‡Z †Kvb wbw`©ó AvqZ‡bi cÖgvY `ªe‡Yi mv‡_ GKwU ARvbv NbgvÎvi `ªe‡Yi wewµqv NwU‡q Ges wewµqvi †kl we›`y ch©šÍ cÖ‡qvRbxq ARvbv `ªe‡Yi AvqZb cwigvc K‡i ARvbv `ªeYwUi NbgvÎv wbY©q Kivi c×wZ‡K UvB‡Uªkb e‡j| Av‡qvwWwgwZ cÖgvY Av‡qvwWb `ªe‡Yi mvnv‡h¨ wewfbœ weRviK c`v‡_©i UvB‡Uªkb Kivi gva¨‡g G‡`i NbgvÎv ev cwigvY wbY©q Kivi c×wZ‡K Av‡qvwWwgwZ ejv nq| Av‡qv‡WvwgwZ ivmvqwbK wewµqv Øviv Av‡qvwWb gy³ K‡i Zv‡K RviK c`v‡_©i †hgbt †mvwWqvg _v‡qvmvj‡dU `ªeY Øviv UvB‡Uªkb Kivi c×wZ‡K Av‡qv‡WvwgwZ e‡j| 2q cÎ Aa¨vq-03 cwigvYMZ imvqb QUANTATIVE CHEMISTRY

376 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ivmvqwbK MYbv (ivmvqwbK wewµqv wfwËK MYbv)t imvq‡bi †h kvLvq gvwÎK cwigv‡Yi wnmve Kiv nq Zv‡KB ivmvqwbK MYbv ejv nq| CONCEPT 01 †h․‡Mi fi , KYv I ms‡KZ welqK MYbv wewfbœ fi m¤úwK©Z Item-01 : cvigvYweK fi GKK: Atomic Mass Unit = 1 amu ,S.I. GK‡K 1 amu Gi gvb = 1.660510-27 kg cÖ‡qvRbxq †g․‡ji cvigvYweK fi t wKQz †g․‡ji Av‡cwÿK cvigvYweK fi ev cvigvYweK fi hv AsK Kivi mgq we‡klfv‡e cÖ‡qvRbt ‡g․j Avt cvt fi ‡g․j Avt cvt fi ‡g․j Avt cvt fi ‡g․j Avt cvt fi H 1 F 19 K 39 Zn 65 He 4 Na 23 Ca 40 As 75 Li 7 Mg 24 Cr 52 Br 80 Be 9 Al 27 Mn 55 Ag 108 B 11 Si 28 Fe 56 I 127 C 12 P 31 Co 59 Au 197 N 14 S 32 Ni 58.7 Hg 200 O 16 Cl 35.5 Cu 63.5 U 235 AvYweK fit †h․‡M Dcw¯
Z wewfbœ †g․‡ji me cigvYyi cvigvYweK f‡ii †hvMdjB †h․‡Mi AvYweK fi| †hgb- cvwbi AvYweK fi (H2O) = (12+16) amu = 18 amu ‡R‡b ivLv fvjt amu GK‡K cvigvYweK fi I AvYweK fi‡K h_vµ‡g Av‡cwÿK cvigvbweK fi I Av‡cwÿK AvYweK fiI ejv nq| ms‡KZ fi (Formula Mass)t AvqwbK †h․‡M Dcw¯
Z Avqbmg~‡ni cvigvYweK f‡ii †hvMdj| †hgb- NaCl Gi ms‡KZ fi = Na cigvYyi fi+Cl cigvYyi fi= 23 amu + 35.5 amu = 58.5 amu ‡gvjvi fit GKK m¤ú„³ AvYweK fiB †gvjvi fi| †hgb- NaCl Gi †gvjvi fi = 58.5 g mol-1 ‡R‡b ivLv fvjt AvbweK f‡ii †Kvb GKK †bB Z‡e †gvjvi f‡ii GKK we`¨gvb| KwZcq cÖ‡qvRbxq jeY mg~nje‡Yi ms‡KZ je‡Yi bvg Avt fi je‡Yi ms‡KZ je‡Yi bvg Avt fi FeSO4.7H2O meyR wfwUªIj 278 Na2CO3.10H2O Kvco KvPv †mvWv 286 ZnSO4. 7H2O mv`v wfwUªIj 287 Na2SO4.10H2O Møyevi jeY 322 MgSO4. 7H2O Bckg jeY 246 K2SO4.Al2(SO4)3. 24H2O wdUwKwi/ cUvk Gjvg 948 CuSO4.5H2O eøy-wfwUªIj 249.5 CaSO4. 2H2O wRcmvg 172 FeSO4.(NH4)2SO4.6H2O ‡gvi jeY 392 NaCl Lv`¨ jeY 58.5 Item-02 : KYv msL¨v m¤úwK©Z †gvj (n) t WRb, Kzwo, kZK BZ¨vw`i gZ †gvjI (mol) GKwU GKK wn‡m‡e e¨eüZ nq| A¨v‡fvM¨v‡Wªv msL¨vt 1 †gvj f‡i wbw`©ó msL¨K AYy, cigvYy, Avqb ev B‡jKUªb _vK‡j G msL¨v‡K A¨v‡fvM¨v‡Wªv msL¨v ejv nq| A¨v‡fvM¨v‡Wªv msL¨v‡K NA Øviv cÖKvk Kiv nq| NA Gi gvb 6.0231023 n, N I NA Gi g‡a¨ m¤úK©t N = nNA, n =†gvj msL¨v, N = AYyi msL¨v Ges NA = A¨v‡fvM¨v‡Wªv aªæeK ev®úNbZ¡ I AvYweK f‡ii m¤úK© Item-03 : M D 2 A_v©r AvYweK fi = ev®ú NbZ¡ 2 †hgb- GKwU M¨v‡mi AvYweK IRb 50 n‡j Bnvi ev®úNbZ¡ KZ? e¨vL¨v: M D 2 D = 2 50 = 25 ¯’~j ms‡KZ (Empirical Formula) & AvYweK ms‡KZ (Molecules Formula) Item-04 : †h․‡Mi ms‡KZ `yB cÖKvi| h_v- ¯
~jms‡KZ I AvYweK ms‡KZ| ¯’~j ms‡KZ (Empirical Formula)t ¯
~j ms‡KZ †h․‡Mi Aby‡Z we`¨gvb wewfbœ †g․‡ji cigvby msL¨vi AbycvZ cÖKvk K‡i| AvqwbK†h․‡Mi ms‡KZ- mijZg AbycvZ Abyhvqx wjwLZ ms‡KZ‡K AvqwbK †h․‡Mi ms‡KZ ev dg©yjv GKK ejv nq| cvU©-01 MYbvwgwZK imvqb

CHEMISTRY PLUS cwigvYMZ imvqb 377 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES kZKiv mshyw³ n‡Z ¯’~j ms‡KZ wbY©q: GENERAL RULES (WRITTEN) 3 in 1 TRICKS & TIPS(TnT) Step-1: cÖwZwU †g․‡ji kZKiv mshyw³ wbR cvigvYweK fi Øviv fvM Ki‡Z n‡e| Step-2: cÖvß fvMdjmg~n‡K ÿz`ªZg fvMdj Øviv fvM K‡i c~Y© msL¨vq iƒcvšÍi Ki‡Z n‡e| Step-3: fvMdj c~Y©msL¨v bv nq Zvn‡j c~Y©msL¨vi Rb¨ (2/3/4/5) Øviv ¸Y K‡i c~Y© msL¨vq wb‡Z n‡e| Step-4 :cÖwZwU †g․‡ji fvMdj n‡Z cÖvß c~Y©msL¨v †g․‡ji cv‡k ewm‡q ¯
zj ms‡KZ wbY©q Ki‡Z n‡e| ¯’yj ms‡KZ †ei Kivi †KŠkjt ms‡K‡Zi mshyw³ I cÖ‡kœi mshyw³ †hUvi mv‡_ wg‡j hv‡e †mUvB DËi| Ex-01 GKwU †h․‡Mi kZKiv mshyw³‡Z C = 40%, H = 6.6% Ges O = 53.3%, †h․MwUi ¯’zj ms‡KZ †KvbwU? [JU: 10-11; RU: 09-10, 08-09, 07-08] A. CHO B. C2HO C. CH2O D. CHO2 GENERAL RULES (WRITTEN) 3 in 1 TRICKS & TIPS(TnT) 01. cvigvYweK fi Øviv fvM-C : O : H= 40 12 = 3.33 : 53.3 16 = 3.33 : 6.66 1 = 6.66 02. ÿz`ªZg msL¨v Øviv fvM- C : O : H= 3.33 3.33 = 1: 3.33 3.33 = 1: 6.66 3.33 = 2 ¯
j ms‡KZ = C1H2O1 ev, CH2O ¯’yj ms‡KZ †ei Kivi †KŠkjt ms‡K‡Zi mshyw³ I cÖ‡kœi mshyw³ †hUvi mv‡_ wg‡j hv‡e †mUvB DËi| Ex-02 50% a ‡g․j (cv. msL¨v 15) Ges 50% b ‡g․j (cv. msL¨v 30) wb‡q MwVZ ‡h․MwUi mijZg ms‡KZ ‡KvbwU? mgvavbt 2 5 3 3 10 X X ;X 3 5 30 50 ;X 3 10 15 50 X b a a b a , Xb = Xb Xb = 5 3 5 3 = 1 mijZg ms‡KZ = a2b c~Y© ms‡KZ/AvYweK ms‡KZ (Molecules Formula) t AvYweK ms‡KZ cÖK…Z msL¨v cÖKvk K‡i| AvbweK ms‡KZ = (¯
~j ms‡KZ) n kZKiv mshyw³ n‡Z AvYweK ms‡KZ wbY©q: GENERAL RULES (WRITTEN) 3 in 1 in 1 TRICKS & TIPS(TnT) Step-1: ¯
zj ms‡K‡Zi wbq‡g ¯
zj ms‡KZ ‡ei Ki‡Z n‡e| Step-2:( ¯
zj ms‡KZ) n = AvYweK fi = 2D, m~Î e¨envi n Gi gvb wbY©q Ki‡Z n‡e| Step-3: ¯
zj ms‡K‡Z n Gi gvb ewm‡q ¸Y K‡i w`‡Z n‡e, Zvn‡jB AvYweK ms‡KZ cvIqv hv‡e| AvYweK ms‡KZ wbY©qt cÖ‡kœ Ackb †U÷ K‡iB mivmwi mwVK DËiwU wbY©q Kiv hvq| wKfv‡e? cÖ‡kœi AvYweK fi‡K Ack‡bi AvYweK f‡ii mv‡_ wgjv‡j †hwU wg‡j hv‡e †mwUB mwVK DËi| [Option Test] Ex-01 ev®ú NbZ¡ 44 wewkó GKwU †h․‡M C = 54.54%, H = 9.09%, O = 36.3% cwigvY Av‡Q| †h․MwUi AvYweK ms‡KZ n‡e? GENERAL RULES (WRITTEN) 3 in 1 TRICKS & TIPS(TnT) Step-1: C = 54.54 12 = 4.545, H = 9.09 1 = 9.09, O = 36.3 16 = 2.26 Step-2: C = 4.545 2.26 = 2.011 2, H = 9.09 2.26 = 4.022 4, O, 2.26 2.26 = 1 Step-3: †h․MwUi ¯
zj ms‡KZ : C2H4O Step-4: (C2H4O)n = 44 2 (12 2 + 1 4 + 16)n = 88 44n = 88 n = 2 Step-5: †h․MwUi AvYweK ms‡KZ (C2H4O)2 = C4H8O2 AvYweK ms‡KZ wbY©q [Option Test] t cÖ‡kœ Ackb †U÷ K‡iB mivmwi mwVK DËiwU wbY©q Kiv hvq| wKfv‡e? AvYweK fi = 2D=244=88 cÖ‡kœi ‡h Ack‡bi AvYweK fi 88 †mwUB mwVK DËi| C4H8O2 = 12 4 + 1 4 + 16 2= 84 nvB‡WªvKve©‡bi AvYweK ms‡KZ wbY©q: Item-05 : Ex-01 10 cm3 AvqZ‡bi GKwU nvB‡WªvKve©b M¨vm I 43 cm3 AvqZ‡bi Aw·‡Rb M¨v‡mi wgkÖY‡K `nb K‡i kxZj n‡jv| kxZj M¨vm wgkÖ‡Yi AvqZb 28 cm3 cvIqv †M‡jv| G M¨vm wgkÖ‡Y Kw÷K †mvWv `ªeY †hvM K‡i SvKv‡bv n‡jv, M¨vm wgkÖYwU AvqZb K‡g 8cm3 n‡jv nvB‡WªvKve©‡bi AvYweK ms‡KZ wbY©q Ki? [RUET. 2019-20] mgvavbt CxHy (g) + x + y 4 O2 (g) xCO2 (g) + y 2 H2O(l) CxHy O2 O2 Excess 10 cm3 43 cm3 H2O CO2 O2 Excess 28 cm3 bMb¨ NaOH O2 Excess 8 cm3 VCxHy = 10 cm3 ; wewµqvq AskMÖnYK…Z O2 Gi AvqZb VO2 (43 8) = 35 cm3 ; wewµqvq Drcvw`Z CO2 Gi AvqZb VCO2 = (28 8) = 20 cm3 †gvj AbycvZ I AvqZb AbycvZ Zzjbv K‡i cvBnCO2 nCx Hy = x 1 = 20 10 = 2 nO2 nc x Hy = x + y 4 1 = 35 10 = 3.5 †h‡nZz, x + y 4 = 3.5 y 4 = (3.5 2) = 1.5 y = 6 Ges x = 2 nvB‡WªvKve©bwUi ms‡KZ C2H6 (B‡_b) we.`ª.: cvwb Gi AvqZb bMb¨ a‡i †bIqv n‡q‡Q †h‡nZz GwU Zij Ae¯
vq _v‡K|

378 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES Short Ans Question SAQWRITTEN SUGGESTION BAQ Broad Ans Question cÖkœ-1. Zzu‡Zi AYy‡Z KZ AYy †Kjvm cvwb _v‡K? [BUTex. 2009-10] DËi: CuSO4.5H2O 5 AYy| cÖkœ-2. meyR wfwUªIj Gi AvYweK fi KZ? DËi: Item-01see Chart cÖkœ-3. me‡P‡q Kg AvYweK fi wewkó bvB‡Uªv‡R‡bi GKwU †h․‡Mi ms‡KZ †jL? [BUTex. 2009-10] DËi: NH3 REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. 98 MÖvg AvYweK IRb Øviv †Kvb †h․‡Mi 1 MÖvg †gvj eySvq? [DU.1999-00] A. Carbonic acid B. Nitric acid C. Hydrochloric acid D. Sulphuric acid mwVK DËi: D. Sulphuric acid e¨vL¨v: H2CO3 Gi Av: fi = 1×2+12+16×3 = 62 HNO3 = 1+14+16×3 = 63 HCl = 35.5+1 = 36.5 H2SO4 = 1×2+32+16×4 = 2+32+64 = 98 JU 01. cUvm A¨vjv‡gi mv‡_ KZ AYy †Kjvm cvwb _v‡K? [JU:2013-2014] A. 2 B. 7 C. 24 D. 10 mwVK DËi: C. 24 e¨vL¨v: K2SO4.Al2(SO4)3.24H2O cUvm A¨vjvg /wdUwKwi 02. GKwU †h․‡M 85% Ag Ges 15% F Av‡Q (Ag I F Gi cvigvYweK fi 108 I 19) †h․MwUi ¯’~j ms‡KZ †KvbwU? [JU.2009-2010] A. AgF B. Ag2F C. AgF2 D. Ag2F2 mwVK DËi: A. AgF e¨vL¨v: Ag = 85 108 = 0.78, F = 0.78 19 15 Avevi, Ag = 1 0.78 0.78 1, 0.78 0.78 F AgF 03. GKwU †h․‡M 86% Kve©b Ges 14% nvB‡Wªv‡Rb Av‡Q| †h․MwUi ¯’~j ms‡KZ †KvbwU? [JU: 2009-10] A. CH B. CH2 C. CH3 D. CH4 mwVK DËi: B. CH2 e¨vL¨v: (i) cvigvYweK fi Øviv fvM-C : H= 86 12 = 7.166 : 14 1 = 14.0 (ii) ÿz`ªZg msL¨v Øviv fvM- C : H = 7.166 7.166 = 1: 14.0 7.166 = 2 ¯
j ms‡KZ = C1H2= CH2 ¯’yj ms‡KZ †ei Kivi †K․kjt ms‡K‡Zi mshyw³ I cÖ‡kœi mshyw³ †hUvi mv‡_ wg‡j hv‡e †mUvB DËi|A_©vr †h Ack‡b 86% C Ges 14% H Av‡Q †mUvB DËi| RU 01. †Kvb •Re ‡h․‡Mi ¯’~j ms‡KZ CH2O Ges AvYweK fi 180 n‡j ‡h․MwUi AvYweK ms‡KZ wK n‡e? [RU-H. 2015-16] A. C2H4O2 B. C2H6O2 C. C6H12O6 D. C12H22O11 mwVK DËi: C. C6H12O6 e¨vL¨v: (CH2O)n = 180 n = 180 30 = 6 (CH2O)6 = C6H12O6 A_ev AvYweK fi Øviv Ackb †U÷ Ki 02. GKwU •Re †h․‡M C = 75.94%, H = 6.33% Ges N = 17.72% Av‡Q| †h․MwUi ev®ú NbZ¡ 39.5 n‡j Gi AvYweK ms‡KZ- [RU. 2012-2013] A. C6H7N B. C5H5N C. C7H7N D. C7H9N mwVK DËi: B. C5H5N e¨vL¨v: M = D 2 = 39.5 2 = 79; †h Ack‡bi AvYweK fi 79 ZvB DËi| 03. 180 AvYweK f‡ii GKwU †h․‡M 40% C, 36.6 % H _vK‡j †h․MwUÑ [RU: 12-13] A. ivB‡evR B. wW-Aw· ivB‡evR C. M¨vjv‡±vR D. †KvbwUB bq mwVK DËi: D. †KvbwUB bq e¨vL¨v: ivB‡evR I wW. Aw· ivB‡ev‡Ri AvYweK fi h_vµ‡g 150 I 134| Galactose G H2 Gi cwigvY 6.66%| 04. mv`v wfwUªIj †KvbwU? [RU.2007-2008] A. FeSO4.7H2O B. ZnSO4. 7H2O C. MgSO4. 7H2O D.CaSO4. 2H2O mwVK DËi: B. ZnSO4. 7H2O 05. GKwU M¨v‡mi ev®úNbZ¡ 22| M¨vmwUi AvYweK IRb KZ? [RU. 06-2007] A. 22 B. 44 C. 11 D. 66 mwVK DËi: B. 44 e¨vL¨v: M = D×2 = 22×2 = 44 06. hw` 32gm †Kvb M¨v‡mi AvqZb cÖgvY ZvcgvÎv I Pv‡c 11.2 wjUvi nq Zvn‡j M¨vmwUi ev®úNbZ¡ n‡e? [RU.2006-2007] A. 64 B. 16 C. 128 D. 32 mwVK DËi: D. 32 e¨vL¨v: 22.4 V M m 11.2 22.4 32 M = 64 M D2 ev, D 64 2 = 32 07. 300 MÖvg Møy‡Kv‡Ri MÖvg AvYweK fi KZ? [RU.08-09] A. 1.66 B. 2.86 C. 3.66 D. 4.76 mwVK DËi: A. 1.66 e¨vL¨v: ms‡KZ: C6H12O6,Avt fi = 12×6+1×12+16×6 = 180 n = M m = 1.66 180 300 CU 01. ev®ú NbZ¡ 44 wewkó GKwU †h․‡M C=54.54%, H=9.09% I O=36.3%cwigv‡Y Av‡Q| †h․MwUi AvYweK ms‡KZ n‡e- [CU.2014-15, RUET. 2003-04] A. CH2O B. C2H4O2 C. C3H6O3 D. C4H6O4 E. C4H8O2 mwVK DËi: E. C4H8O2

CHEMISTRY PLUS cwigvYMZ imvqb 379 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES e¨vL¨v: ‡h‡nZz ev®úNbZ¡ †`Iqv Av‡Q, myZivs AvYweK fi 442 = 88; AvYweK fi †_‡K Option test K‡i †ei Ki‡Z cvwi, CH2O=30,C2H4O2 = 60, C3H6O3 = 90, C4H6O4 = 118, C4H8O2 = 88 02. STP -†Z †Kv‡bv M¨v‡mi 11.2 wjUv‡ii IRb wb‡`©k K‡i H M¨vmwUi- [CU.2011-2012] A. MÖvg-AvYweK IRb B. ev®ú NbZ¡ C. MÖvg-Zzj¨v¼ fi D. MÖvg-cvigvYweK IRb E. AYyi msL¨v mwVK DËi: B. ev®ú NbZ¡ e¨vL¨v: †h‡nZz M¨v‡mi AvqZb cÖgvY AvqZ‡bi A‡a©K †m‡nZz AvYweK fi A‡a©K n‡e Ges A‡a©K AvYweK fi‡K ev®ú NbZ¡ ejv nq| 03. 74 AvYweK f‡ii GKwU •Re †h․‡Mi kZKiv mshyw³, C(48.65%), H(8.11%), I O(43.24%) n‡j †h․MwUi AvYweK ms‡KZ n‡e? [CU.2010-2011] A. C2H4O2 B. C3H6O C. C3H6O2 D. C2O6O mwVK DËi: C. C3H6O2 e¨vL¨v: AvYweK ms‡KZ †ei Kivi †K․kjt AvYweK ms‡KZ wbY©qt cÖ‡kœ Ackb †U÷ K‡iB mivmwi mwVK DËiwU wbY©q Kiv hvq| wKfv‡e? cÖ‡kœi AvYweK fi‡K Ack‡bi AvYweK f‡ii mv‡_ wgjv‡j †hwU wg‡j hv‡e †mwUB mwVK DËi| [Option Test] 04. †nvqvBU wfwUªI‡ji AvYweK ms‡KZ ZnSO4.7H2O Gi AvYweK fi KZ? [CU.2008-2009] A. 284 B. 283 C. 287 D. 282 mwVK DËi: C. 287 e¨vL¨v: ZnSO4.7H2O = 65 + 32+ 164+718 = 287 05. CuSO4 mv`v cvDWvi Gi g‡a¨ cvwb †hvM Ki‡j `ªe‡Yi wK eY© cvIqv hvq? [CU.2009-2010] A. mv`v B. bxj C. meyR D. jvj mwVK DËi: B. bxj e¨vL¨v: CuSO4 + 5H2O CuSO4.5H2O (bxj) 06. GKwU M¨v‡mi AvYweK IRb 50 n‡j Bnvi ev®úNbZ¡ KZ? [CU.2008-2009] A. 50 B. 25 C. 100 D. 22.4 E. 80 mwVK DËi: B. 25 e¨vL¨v: M = D 2 D = 50 2 = 25 07. eøy wfwUªI‡ji AvYweK fi KZ? [CU.2008-2009, RU. 2007-08, 2008-09] A. 24.958 B. 249.5 C. 247.48 D. 24958 mwVK DËi: B. 249.5 e¨vL¨v: eøywfwUªI‡ji ms‡KZ- CuSO4.5H2O = 63.5 + 32 + 16 4 + 5 18 = 249.5 08. GKwU •Re †h․M we‡kølY K‡i fi wnmv‡e kZKiv 40 fvM Kve©b, 53.3 fvM Aw·‡Rb I Aewkó nvB‡Wªv‡Rb cvIqv †M‡j ‣Re †h․MwUi ¯’yj ms‡KZ n‡e (•Re †h․MwUi Av:fi 180) [CU.2008-2009] A. CHO B. C2HO C. C2H2O D. CH2O mwVK DËi: D. CH2O e¨vL¨v: C:H:O = 40 12 : 6.7 1 : 53.5 16 = 3.33:6.7:3.33 = 1:2:1 ms‡KZt CH2O 09. cÖgvY ZvcgvÎv I Pv‡c 1 ‡gvj M¨v‡mi AvqZb- [CU. 2004-2005] A. 22.41dm3 B. 2241 dm3 C. 2041 dm3 D. 20.41 dm3 mwVK DËi: A. 22.41dm3 e¨vL¨v: cÖgvY ZvcgvÎv I Pv‡c GK †gvj M¨v‡mi AvqZb 22.4L[1L=1dm3 ] BRU 01. wb‡Pi †KvbwU Abv`ª © †Kjvm? [BRU:2013-2014] A. mvaviY jeY B. cUvk Gjvg C. Møyevi jeY D. Bcmg jeY mwVK DËi: A. mvaviY jeY STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION SUST 01. wbw`©ó ZvcgvÎv I Pv‡c 20mL CnH8O AvYweK ms‡K‡Zi M¨vmxq •Re †h․M m¤ú~Y©iƒ‡c `nb Ki‡Z 90mL O2 cÖ‡qvRb n‡j n Gi gvb KZ? [SUST. 2014-15] A. 1 B. 2 C. 3 D. 4 E. 5 mwVK DËi: C. 3 e¨vL¨v: O nCO 4H O 2 2n 3 CnH8O 2 2 2 90 n 3 2 2n 3 20 02. mwVK A¨v‡fvM¨v‡Wªvi msL¨vwU nj- [SUST.2006-2007;CU.2009-2010] A. NA = 6.002×1023 B. NA = 6.202×1023 C. NA = 6.220×1022 D. NA = 6.022×1023 mwVK DËi: D. NA = 6.022×1023 e¨vL¨v: e¯‧i GK †gvj G hZ msL¨K AYy _v‡K ‡mB msL¨v †K A¨v‡fvM¨v‡Wªvi msL¨v e‡j| G‡K NA Øviv cÖKvk Kiv nq| NA Gi gvb 6.023 1023 STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION KUET 01. GKwU †h․‡M 61.02% C, 15.25% H Ges 23.73% N Av‡Q| GB †h․‡Mi 1 litre Gi fi 2.63 g (S.T.P.-†Z) n‡j AvYweK ms‡KZ Kx? [KUET. 2003-04, 2005-06, RUET. 2006-07, 2008-09, 2012-13, CUET. 2008- 09, 2009-10] e¨vL¨v: 1 mole M¨vm 22.4 litre M = 2.63 22.4 = 59 †g․j cvigvYweK fi Øviv fvMK…Z dj me©wb¤œ fvMdj Øviv fvMK…Z dj c~Y© msL¨vi AbycvZ ¯’zj ms‡KZ C 61.02 12 = 5.085 3 3 C3H9N H 15.25 1 = 15.25 8.997 9 9 N 23.74 14 = 1.693 1 1 †h․‡Mi AvYweK ms‡KZ (C3H9N)n cÖkœg‡Z, (3 12 + 9 1 + 14)n = 59 n = 1 AvYweK ms‡KZ = C3H9N (Ans.) RUET 01. mvaviY ZvcgvÎv I Pv‡c 12 mL GKwU nvB‡WªvKve©b M¨vm‡K 90 mL Aw·‡Rb M¨v‡mi mv‡_ wgwkÖZ K‡i we‡ùvwiZ Kiv nj| we‡ùvi‡Yi ci kxZj K‡i Drcbœ M¨v‡mi AvqZb 72 mL nj| H M¨vm wgkÖY‡K KwjPz‡bi ms¯ú‡k© ivLvi ci 36 mL AvqZb nq| nvB‡WªvKve©b Gi AvYweK ms‡KZ wbY©q Ki| [RUET. 2015-16] e¨vL¨v: CxHy + x + y 4 O2 xCO2 + y 2 H2O V = 12mL; Vx = (72 – 36)mL = 36mL x = 3 V 1 + y 4 = (90 + 12 – 72)mL = 30mL y = 6 nvB‡WªvKve©b Gi AvYweK ms‡KZ = C3H6

380 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES CONCEPT 02 Zzj¨ msL¨v Ges A¤øZ¡-ÿviKZ¡ wbY©q Item–01: Zyj¨msL¨v (e)t mnRfv‡e ewj? Òhvi hv Av‡Q †m-B msL¨vB Zvi Zzj¨msL¨vÓ| †hgb:Ñ avZzi Zzj¨msL¨v = avZzi †hvRbx [‡hvRbx Qvov avZzi wK-B ev Av‡Q !] ‡hgbt Na Gi Zzj¨msL¨v, eNa=1, KviY †mvwWqv‡gi †hvRbx 1 Ca Gi Zzj¨msL¨v, eCa=2 , KviY K¨vjwmqv‡gi †hvRbx 2 Abyiæcfv‡e, Zn Gi Zzj¨msL¨v, eZn=2. BZ¨vw`| AavZzi Zzj¨msL¨v = AavZzi †hvRbx AYy‡Z cigvYyi msL¨v †hgb- H2 Gi Zzj¨ msL¨v = 1 2 = 2; O2 Gi Zzj¨ msL¨v = 2 2 = 4 Gwm‡Wi Zzj¨msL¨v = Gwm‡W cÖwZ¯’vcbxq nvB‡Wªv‡Rb msL¨v [Gwm‡Wi m¤ú`-B †Zv n‡”Q Zvi nvB‡Wªv‡Rb] ‡hgbt HCl Gi Zzj¨msL¨v, eHCl = 1 [KviY HCl Gi m‡e©v”P 1wU H cigvYy cÖwZ¯
vcb‡hvM¨] H2SO4 Gi Zzj¨msL¨v, e 2 H2SO4 [KviY H2SO4 Gi m‡e©v”P 2wU H cigvYy cÖwZ¯
vcb‡hvM¨] H3PO4 Gi Zzj¨msL¨v, eH3 PO4 = 3 [KviY H3PO4 Gi m‡e©v”P 3wU H cigvYy cÖwZ¯
vcb‡hvM¨] H3PO3 Gi Zzj¨msL¨v, eH3 PO3 = 2 [KviY H3PO3 Gi m‡e©v”P 2wU H cigvYy cÖwZ¯
vcb‡hvM¨] H3PO2 Gi Zzj¨msL¨v, eH3 PO2 = 1 [KviY H3PO2 Gi m‡e©v”P 1wU H cigvYy cÖwZ¯
vcb‡hvM¨] A_©vr, GK-ÿviKxq Gwm‡Wi Zzj¨msL¨v = 1, wØ -ÿviKxq Gwm‡Wi Zzj¨msL¨v = 2 ,wÎ -ÿviKxq Gwm‡Wi Zzj¨msL¨v = 3 ÿvi‡Ki Zzj¨msL¨v = ÿviK hZwU OH– Avqb Z¨vM K‡i ev hZ¸wj (H + ) MÖnb K‡i| NaOH Gi Zzj¨msL¨v eNaOH = 1 GK K_vq, ÿvi‡Ki Zzj¨msL¨v = ÿvi‡Ki OH– Gi msL¨v Ca(OH)2 Gi Zzj¨msL¨v Ca OH 2 e = 2 Al(OH)3 Gi Zzj¨msL¨v eAl(OH)3 = 3 GK - A¤øxq ÿvi‡Ki Zzj¨msL¨v 1 wØ - A¤øxq ÿvi‡Ki Zzj¨msL¨v 2 wÎ - A¤øxq ÿvi‡Ki Zzj¨msL¨v 3 jyBm ÿv‡ii Zzj¨ msL¨v: hZ¸‡jv H + MÖnY K‡i| †hgb- NH3 Gi Zzj¨ msL¨v 1, eNH3 = 1 (NH3, 1wU H + MÖnY K‡i NH4 + G cwiYZ nq|) je‡Yi Zzj¨msL¨v = je‡Y Dcw¯’Z avZzi †gvU †hvRbx ev K¨vUvq‡bi PvR©| [avZzi †hvRbx cigvYyi msL¨v] ‡hgbt NaCl Gi Zzj¨msL¨v, eNaCl = 1 [KviY NaCl- G 1wU Na cigvYy †gvU †hvRbx = 1] CaCO3 Gi Zzj¨msL¨v, CaCO3 e = 2 [KviY CaCO3 - G 1wU Ca cigvYy †gvU †hvRbx = 2] Na2CO3 Gi Zzj¨msL¨v, Na2CO3 e = 2 [KviY Na2CO3- G 2wU Na cigvYy †gvU †hvRbx = 2] ZnSO4 Gi Zzj¨msL¨v, e 2 ZnSO4 [KviY ZnSO4- G 1wU Zn cigvYy †gvU †hvRbx = 2] RviK-weRvi‡Ki Zzj¨msL¨vt Rvi‡Ki Zzj¨msL¨v = RviK hZ¸wj e – MÖnY K‡i = RviY gv‡bi cwieZ©b H AYy‡Z †g․‡ji cigvYyi msL¨v ‡hgbt KMnO4 Gi Zzj¨msL¨v, eKMnO4 = 5 (GwmW gva¨‡g) K2Cr2O7 Gi Zzj¨msL¨v, eK2 Cr2 O7 = 6 (GwmW gva¨‡g) FeCl3 Gi Zzj¨msL¨v, FeCl3 e = 1 (GwmW gva¨‡g) mg¯Í n¨v‡jv‡Rb (e X2 ) = 2 BZ¨vw`| weRvi‡Ki Zzj¨msL¨v = weRviK hZ¸wj e - `vb K‡i = RviY gv‡bi cwieZ©b H AYy‡Z †g․‡ji cigvYyi msL¨v ‡hgbt H2S Gi Zzj¨msL¨v, H2S e = 2 (GwmW gva¨‡g), FeSO4 Gi Zzj¨msL¨v, eFeSO4 = 1 (GwmW gva¨‡g) H2O2 Gi Zzj¨msL¨v, H2O2 e = 2 (GwmW gva¨‡g) BZ¨vw`| ¯§iYxqt `ªæZ AsK Kivi Rb¨ PvU©wU gyL¯’ Ki‡e: bvg Zzj¨msL¨v bvg Zzj¨msL¨v bvg Zzj¨msL¨v bvg Zzj¨msL¨v KMnO4 5 FeSO4 1 Cl2/Br2/I2 2 FeC2O4 3 K2Cr2O7 6 H2S 2 FeCl3 1 Na2S2O3 1 (e¨wZµg) KClO3/KBrO3/ KIO3 6 H2C2O4 2 H2O2 2 SO2 2 Sn2+/Sn4+ 2 Fe2+/Fe3+ 1 CuSO4 1 KI 1 Zyj¨ msL¨vi kU©KvU© wUªKm: Dc‡ii mg¯Í K_v¸‡jv‡K Avgiv GK K_vq wb‡Pi Q‡Ki gva¨‡g cÖKvk Ki‡Z cvwiZzj¨msL¨v = abvZœK Avq‡bi msL¨v †hvRbx M„wnZ ev ewR©Z B‡jKUªb msL¨v GwmW ¶viK jeY RviK weRviK HCl=1, H2SO4= 2 H3PO4= 3 NaOH=1, Ca(OH)2 = 2 Al(OH)3 = 3 NaCl =1,CaCO3=1 CaO=2, Al2O3 = 6 MgO=2, Fe2O3 = 6 KMnO4=5,K2Cr2O7=6 Cl2/Br2/I2 = 2 P2O4 = 8 FeSO4=1, CuSO4=1 SO2=2, Na2S2O3=1 H2O2=2, KI = 1

CHEMISTRY PLUS cwigvYMZ imvqb 381 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES Gevi Av‡iKwU g¨vwRK jÿ¨ K‡iv: Zzj¨ msL¨vi gva¨‡g Avgiv 5wU cÖ‡kœi DËi Ki‡Z cvwi1. A¤øZ¡ I ÿviKZ¡ wbY©q 2. Zzj¨ fi wbY©q 3. ‡gvjvi AbycvZ ev †gvj msL¨vi AbycvZ wbY©q (CONCEPT-13) 4. RviY-weRviY mgZvKiY(CONCEPT-12) 5. A¤øwgwZ I ÿviwgwZi MvwYwZK cÖ‡qvM(CONCEPT-09) Item–02: A¤øZ¡ I ÿviKZ¡ wbY©q: 1wU ÿviK ev avZe A·vBW hZwU Gwm‡Wi mv‡_ wewµqv K‡i Zvi A¤øZ¡ ZZ †hgb- Al2O3 + 6HCl = 2AlCl3 + 3H2O Al2O3 Gi A¤øZ¡ = 6 1wU GwmW ev AavZe A·vBW hZwU ÿvi‡Ki mv‡_ wewµqv K‡i Zvi ÿviKZ¡ ZZ †hgb- H3PO4 + 3NaOH = Na3PO4 + 3H2O H3PO4Gi ÿviKZ¡ = 3 A¤øZ¡ I ÿviKZ¡ wbY©‡q gRvi wUªKm: A¤øZ¡ I ÿviKZ¡ = Zyj¨ msL¨v A_©vr A¤øZ¡ I ÿviKZ¡ hv Zzj¨ msL¨v Zv Avjv`vfv‡e mgxKiY cÖ‡qvM K‡i wn‡m‡ei †Kv‡bv cÖ‡qvRb bvB| †hgb- Al2O3 Gi A¤øZ¡ = 6 KviY Gi Zzj¨ msL¨v = 6 Item–03: Zzj¨ fi m¤úwK©Z Z_¨vejxt Kgb m~Î t Zzj¨fi = AvYweKfi Zzj¨ msL¨v E=M e Ex.01: NaCl Gi Zzj¨ fi KZ? Solution: NaCl Gi Zzj¨ fi = 58.5 1 58.5 e M Ex.02: NaOH Gi Zzj¨ fi KZ? Solution: NaOH Gi Zzj¨ fi = 40 1 40 e M Ex.03: H3PO4 Gi Zzj¨ fi KZ? Solution: H3PO4 Gi Zzj¨ fi = 32.67 3 98 Ex.04: KMnO4 Gi Zzj¨ fi KZ? Solution: KMnO4 Gi Zzj¨ fi = 31.6 5 158 SAQ: [Short Answer Question] cÖkœ-01. ivmvqwbK mgxKi‡Yi mvnv‡h¨ †`LvI †h, KCN Gi Zzj¨ IRb Bnvi AvYweK IR‡bi wظY n‡Z cv‡i? [KUET. 2003-04] DËi: 6KCN + Fe(OH)3 K3[Fe(CN)6] + 3KOH; Zzj¨ fi = AvYweK fi GK †gvj e¯‧‡Z `ªexf~Z OH Gi msL¨v = 6 M 3 = 2M [M = KCN Gi AvYweK fi] cÖkœ-02. H3PO3 Gi Zzj¨ fi KZ? DËi: H3PO3 Gi Zzj¨ fi = M e = 98 2 =49 REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION CU 01. w؇hvRx g¨vM‡bwmqv‡gi Zzj¨ IRb 12 n‡j Gi cvigvYweK IRb KZ? [CU.2011-12] A. 45 B. 36 C. 6 D. 12 E. 24 mwVK DËi: E. 24 e¨vL¨v: E = M e M=Ee=122=24 IU 01. CO2-Gi ÿviKZ¡ KZ? [IU. 2015-16] A. 4 B. 1 C. 3 D. 2 mwVK DËi: D. 2 e¨vL¨v: CO2 Gi ÿviKZ¡ 2, KviY GKwU CO2 AYy `ywU GK A¤øxq ÿv‡ii mv‡_ wewµqv K‡i| wewµqvwU, CO2 + 2NaOH Na2CO3 + H2O 02. 3Cl2 + 6NaOH→5NaClO3 + 3H2O wewµqvwUi †ÿ‡Î †K¬vwi‡bi Zzj¨ IRb- [IU:2013-2014] A. 42.6 B. 35.5 C. 59.1 D. 71 mwVK DËi: B. 35.5 e¨vL¨v: E = M e = 71 2 = 35.5 03. K2Cr2O7 †h․MwUi Zzj¨ IRb Gi cvigvYweK IR‡bi KZ Ask? [IU.2011-2012] A. 1/3 B. 1/6 C. 1/2 D. 1/5 mwVK DËi: B. 1/6 e¨vL¨v: E = M e = M 6 STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION MBSTU 01. Al2O3 Gi A¤øZ¡ n‡”Q- [MBSTU-B. 2019-20; MBSTU. 2014-15] A. 2 B. 3 C. 4 D. 6 mwVK DËi: D. 6 e¨vL¨v: Al2O3 Gi A¤øZ¡ 6; Al2O3 + 6HCl 2AlCl3 + 3H2O 02. CaO Gi A¤øZ¡ KZ? [MBSTU. 2015-16] A. 1.0 B. 2.0 C. 4.0 D. 6.0 mwVK DËi: B. 2.0 PSTU 01. M2O3 A·vBWwUi A¤øZ¡ KZ? [PUST. 2013-14] A. 2 B. 4 C. 6 D. 8 mwVK DËi: C. 6 A¤øZ¡ ev AvgZ¡ ev KjvZ¡- ai, Zzwg 5wU Avg †L‡Z cvi GLb †Zvgvi AvgZ¡ KZ-5 A_ev Zzwg 5wU Kjv †L‡Z cvi GLb †Zvgvi KjvZ¡ KZ-5 †Zgwbfv‡e, GKwU GwmW hZwU ÿvi †L‡Z cv‡i Zvi ÿviKZ¡ ZZ|

382 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES CONCEPT 03 mgxKiY wfwËK ivmvqwbK MYbv (ivmvqwbK mgxKiY †_‡K Drcv` M¨v‡mi cwigvY wbY©q) Item-01: GK bR‡i ¸iæZ¡c~Y© wewµqv mg~n: (i) CaCO3+2HCl –– CaCl2 + CO2 + H2O , (ii) 2NaOH + CO2 Na2CO3 + H2O (iii) 2 KClO3 –– 2 KCl + 3O2 , (iv) 2HgO –– 2Hg + O2 ,(v) CaCO3 C 600 CaO + CO2 (vi) Ca3(PO4)2 –– 3CaO +P2O5 , (vii) ZnO+C –– Zn +CO ,(viii) MgO + 2HCl –– MgCl2+H2O (ix) CuO + H2 –– Cu + H2O (x) 3Fe + 4H2O –– Fe3O4+ 4H2 wewfbœ ai‡Yi mgxKib : K¼vj mgxKiY Zn+HClZnCl2+H2 mylg / mgZvhy³ mgxKiY Zn+2HClZnCl2+H2 AvYweK mgxKiY NaCl(aq)+AgNO3(aq) AgCl(s)+NaNO3(aq) Item-02: EXCLUSIVE LAW : 2 2 1 1 M m M m m1 = cÖ_g e¯‧i fi; m2 = wØZxq e¯‧i fi M1 = cÖ_g e¯‧i AvYweK fi; M2 = wØZxq e¯‧i AvYweK fi MODEL EXAMPLE-01: 84 g Kve©b Øviv CuO †K weRvwiZ Ki‡j KZ MÖvg Kcvi Drcbœ nq? (Cu = 63.5) GENERAL RULES 3 in 1 SHORTCUT TIPS CuO + C CO + Cu 12 63.5 12g C †_‡K Cu Drcbœ nq 63.5g 84 g " " " " " 63.5 84 12 = 444.5 g 2 2 1 1 M m M m 84 12 = m 63.5 m = 444.5 g MODEL EXAMPLE-02: ÷xg n‡Z 20g H2 cÖ¯‘Z Ki‡Z wK cwigvY Avqib cÖ‡qvRb? GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) 3Fe + 4H2O Fe3O4 + 4H2 3 56 4 2 168 8 8g H2 cÖ¯‧Z Ki‡Z Fe cÖ‡qvRb 168g 20g " " " " " 168 20 8 = 420g 2 2 1 1 M m M m m g m 420 8 20 3 56 1 1 MODEL EXAMPLE-03: 95% weï× Pzbvcv_‡ii 200 gm ‡K DËß Ki‡j KZ MÖvg Pzb cvIqv hvq? [DU-1998-99; CU-10-11, SUST., RU. 10-11, RU. 07-08] GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) CaCO3 CaO + CO2 100 56 95% weï× Pzbvcv_‡ii 200 gm = 95 200 100 = 190g 100gm CaCO3 †_‡K CaO cvIqv hvq 56g 190 " " " " " 56 190 100 = 56 19 10 g = 106.4g 95% CaCO3 of 200g = 0.95 200= 190g ; CaO CaO CaCO CaCO M m M m 3 3 100 56 190 mCaO mCaO = 56 19 10 g = 106.4g Item-03: ÷qKxqwgwZ ev mnM AbycvZ m~‡Îi MvwYwZK cÖ‡qvM : aA + bB cC + dD ; nA a = nB b = nC c = nD d A_©vr 2A + 3B 4C nA 2 = nB 3 = nC 4 [n = wewµqvq AskMÖnYKvix †gvj msL¨v] MODEL EXAMPLE-01: 2.2g H2 I 2.2gO2 wewµqv K‡i KZ g cvwb Drcbœ Ki‡e? GENERAL RULES (Written) TRICKS & TIPS (TnT) 2H2 + O2 2H2O nH2 2 nO2 1 = WH2 MH2 1 2 = WO2 MO2 = 2.2 2 1 2 = 2.2 32 = 0.55 = 0.06875 O2 nj wjwgwUs wewµqK nO2 1 = nH2O 2 0.06875 = WH2O MH2O 1 2 0.06875 = WH2O 18 1 2 WH2O = 2.475g (Ans.) 2 2 1 1 M m M m 2.2 32 = m2 36 m2 = 2.475 mZK©t G ai‡bi mgm¨vq `ywU gvb †`Iqv _vK‡j ïaygvÎ eo cvigvYweK fi‡K a‡i wnmve Ki‡jB Pj‡e|

CHEMISTRY PLUS cwigvYMZ imvqb 383 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES MODEL EXAMPLE-02: 2.02gCa Ges 2.02gH2 Gi GKwU wgkªY‡K DËß Ki‡j KZ MÖvg CaH2 Drcbœ n‡e? GENERAL RULES (Written) TRICKS & TIPS (TnT) Ca + H2 CaH2 40g 2g 42g nCa 1 nH2 1 = WCa MCa 1 = WH2 MH2 1 = 2.02 40 = 2.02 2 = 0.0505 = 1.01 GLv‡b wjwgwUs wewµqK n‡jv Ca nCaH2 1 = nCa 1 nCaH2 = nCa WCaH2 MCaH2 = WCa MCa WCaH2 = WCa MCaH2 Mca WCaH2 = 42 2.02 40 WCaH2 = 42 2.02 40 = 2.121g Ca 40g + H2 2g CaH2 42g ; 2 2 1 1 M m M m 40 42 2.02 m2 m2 = 2.12 mZK©t G ai‡bi mgm¨vq `ywU gvb †`Iqv _vK‡j ïaygvÎ eo cvigvYweK fi‡K a‡i wnmve Ki‡jB Pj‡e| MODEL EXAMPLE-03: H2SO4 + 2NaOH Na2SO4 + 2H2O hw` 49g H2SO4 †K NaOH c~Y© cÖkwgZ K‡i Z‡e e¨eüZ NaOH I Drcbœ je‡Yi cwigvY †jL? nH2 SO4 1 = nNaOH 2 = nNa2 SO4 1 WH2 SO4 MH2 SO4 = WNaOH MNaOH 1 2 = WNa2 SO4 MNa2 SO4 49 98 = WNaOH 40 1 2 = WNa2 SO4 142 ; WNaOH = 40g, WNa2 SO4 = 71g GB GKB c×wZ‡Z Avgiv wjwgwUs wewµq‡Ki A¼¸‡jv mn‡RB K‡i †dj‡Z cvwi| MODEL EXAMPLE-04: 50g ‡ebwRb‡K bvB‡Uªkb Ki‡j 55g bvB‡Uªv‡ebwRb cvIqv hvq| Drcv‡`i nvi KZ? [RU. 2019-20] + HNO3 Cn.H2SO4 60˚C 1 mol (C6H6) 1 mol (C6H5 – NO2) = 78g = 123 NO2 78g †ebwRb †_‡K bvB‡Uªv‡ebwRb cvIqv hvq 123g 1g †ebwRb †_‡K bvB‡Uªv‡ebwRb cvIqv hvq 123 78 50g †ebwRb †_‡K bvB‡Uªv‡ebwRb cvIqv hvq 12350 78 = 78.84 Drcv‡`i kZKiv nvi, 55 100 78.84 = 70% REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. Na(s) + H2O (1) NaOH (aq) + 1/2 H2(g) wewµqvq Drcbœ H2 Gi AvqZb STP †Z 221.4mL| KZ †gvj Na wewµqv Ki‡Q| [DU.1998-99] A. 0.01 B. 0.02 C. 0.03 D. 0.04 mwVK DËi: B. 0.02 e¨vL¨v: STP-†Z ½ mol H2 A_©vr 11.2103 mL 1mol Na n 0.018 0.02 11.2 10 221.4 11.2 V n 3 02. 6gm nvB‡Wªv‡Rb‡K AwZwi³ Aw·‡R‡b †cvov‡j Drcbœ cvwbi cwigvY? [DU.98-99] A. 12gm B. 18gm C. 54gm D. 30gm mwVK DËi: C. 54gm e¨vL¨v: 2H2 +O2 2H2O; m 54 36 m 4 6 M m M m 2 2 2 2 1 1 03. STP ‡Z GKwU cv‡Î 5.6gm N2; 6.4 gm O2 M¨vm I 1.8gm Rjxq ev®ú Av‡Q| cv‡Î O2 Gi AvswkK Pvc- [DU.1998-1999] A. 1.00 B. 0.5 C.0.4 D. 0.1 mwVK DËi: C. 0.4 e¨vL¨v: Po2 = nO2 nN2 + nO2 + nH2 O = 6.4 32 5.6 28 + 6.4 32 + 1.8 18 = 0.2 0.2 + 0.2 + 0.1 = 0.2 0.5 = 0.4 JnU 01. 9.15g weï× wRsK A·vBW n‡Z Kve©b weRviY c×wZi gva¨‡g KZ MÖvg weï× wRsK cvIqv hv‡e? [Zn = 65.38] [JnU. 2012-13, DU. 2011-12] A. 7.95 B. 6.54 C. 7.35 D. 5.92 mwVK DËi: C. 7.35 e¨vL¨v: ZnO+C –– Zn+CO 81 12 65 28 2 2 1 1 M m M m 81 65 9.15 m2 m2 =7.343 JU 01. 50 g CaCO3 Gi Zvcxq we‡qvR‡b Drcbœ CO2 Gi fi KZ? [JU-A, Set-A. 2019-20] A. 11g B. 22g C. 44 g D. 88 g mwVK DËi: B. 22g e¨vL¨v: W1 M1 = W2 M2 50 100 = W2 44 W2 = 22 g

384 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES KU 01. 5 MÖvg KClO3 m¤ú~Y© we‡qvwRZ n‡j cÖgvY ZvcgvÎv I Pv‡c KZ ml Aw·‡Rb cvIqv hvq? [KU. 2019-20] A. 274.3 B. 457.16 C. 1275.5 D. 1371.5 mwVK DËi: D. 1371.5 e¨vL¨v: 2KClO3 – 2KCl + 3O2 W M = V 22.4 5 245 = V 3 22.4 V = 1.3715L = 1371.5 mL 02. 10 g gv‡e©j‡K AwZ DËß Ki‡j wK cwigvY KzBKjvBg (CaO) Drcbœ n‡e? [KU.2011-2012] A. 6.6 g B. 5.6 g C. 4.5 g D. 5.0 g mwVK DËi: B. 5.6 g e¨vL¨v: CaCO3 CaO + CO2 CaO CaO CaCO CaCO M m M m 3 3 100 56 10 mCaO mCaO = 5.6 g 03. 30 MÖvg CaCO3 †K DËß Ki‡j †h cwigvY CO2 cvIqv hvq, Zvi Øviv KZ MÖvg NaOH †K Na2CO3 G cwiYZ Kiv hvq? [KU.2009-2010] A. 20g B. 24g C. 34g D. 10g mwVK DËi: B. 24g e¨vL¨v: CaCO3 100g CaO + CO2 44g mCaCO3 MCaCO3 = mCO2 MCO2 30 100 = mCO2 44 MCO2 = 13.2g Avevi, 2NaOH (40 2)g + CO2 44 g Na2CO3 mNaOH MNaOH = mCO2 MCO2 mNaOH = 40 2 13.2 44 = 24g STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION BSMRSTU 01. 4.0gm nvB‡Wªv‡Rb‡K AwZwi³ Aw·‡Rb †cvov‡j Drcbœ cvwbi cwigvY- [BSMRSTU-H.2016-17; DU-2013-14] A. 16 gm B. 18 gm C. 54 gm D. 36 gm mwVK DËi: D. 36 gm e¨vL¨v: 2H2 + O2 2H2O m1 M1 = m2 M2 4 2 = m2 18 m2 = 36 gm STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION BUTex 01. 25gCaCO3 †K Zxeªfv‡e DËß Ki‡j KZ IR‡bi Pzb cvIqv hvq? [BUTex.2013-2014] A. 2.5g B. 10g C. 14g D. 25g mwVK DËi: C. 14g e¨vL¨v: CaCO3 100gm CaO+CO2 56gm ; m1 M1 = m2 M2 25 100= m2 56 m2 = 14 g STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. 15 MÖvg LwogvwU AwaK Zv‡c we‡qvwRZ n‡j wK cwigvY Pzb cvIqv hv‡e? [MAT: 2012-13; RU:2012-13] A. 4.89 B. 8.4 C. 12.96 D. 18.5 mwVK DËi: B. 8.4 e¨vL¨v: fi D‡jøL _vKvq mivmwi- CaCO3 CaO+CO2 1 2 1 1 M m M m ev, 100 56 15 m2 m2 = 8.4 CONCEPT 04 `ªe‡Yi NbgvÎv cÖKv‡ki c×wZmg~n cÖv_wgK K_vt `ªe‡Yi NbgvÎv cÖKvkK c×wZ 5wU| h_v- (1) bigvwjwU, (2) †gvjvwiwU, (3) †gvjvwjwU, (4) kZKiv mshyw³, (5) †gvj fMœvsk| AvaywbK Kv‡j †gvjvwiwU ev NbgvÎvi cwie‡Z© ppm GKK AwaK e¨eüZ n‡”Q| ‡gvjvwiwU, bigvwjwU I †gvjvwjwUt Item-01 : †gvjvi `ªeY t w¯
i ZvcgvÎvq †Kvb `ªe‡Yi cÖwZ wjUvi AvqZ‡b GK †gvj `ªe `ªexf~Z _vK‡j †m `ªeY‡K H `ª‡ei †gvjvi `ªeY ejv nq| †gvjvj `ªeYt 1000g `ªve‡Ki g‡a¨ †Kvb `ª‡ei 1 †gvj `ªexf~Z _vK‡j Drcbœ `ªeY‡K †gvjvj `ªeY e‡j| bigvj `ªeY t ‡gvjvi `ªe‡Y AvYweK fi wKš‧ bigvj `ªe‡Y Zzj¨ fi wnmve Kiv nq| ‡hgb- H2SO4 Gi AvYweK fi 98. wKš‧ Zzj¨ fi, E = 98 2 = 49 †gvjvwjwU, †gvjvwiwU, bigvwjwUi we¯ÍvwiZ Z_¨t welq ‡gvjvwiwU bigvwjwU †gvjvwjwU cÖKvk S N m fi wnmve `ªe‡Yi AvYweK fi `ªe‡Yi Zzj¨ fi `ªve‡Ki fi ZvcgvÎvi Dci wbf©ikxj wbf©ikxj wbf©ikxj bq mve©Rbxb ï× wKbv bv bv n¨vu GKK molL-1 ev M molL-1 mol Kg-1 MvwYwZK mgxKiY S = n V = m V(L) M N = m 1000 V E = S e m = n Wkg (`ªveK) = m 1000 M W Gevi we‡kølYx `„wó wb‡q D`vniY jÿ¨ Ki Ex.1 2M Na2CO3 `ªe‡Yi bigvwjwU KZ? mgvavbt bigvwjwU = ‡gvjvwiwUZzj¨ msL¨v A_©vr N = Se =22=4N Ex.2 3N Na2SO4 `ªe‡Yi ‡gvjvwiwU KZ? mgvavbt N =Se ev S= N e = 3 2 = 1.5 Ex.3 0.5MH3PO4 `ªe‡Yi bigvwjwU KZ? mgvavbt N=Se=0.53=1.5

CHEMISTRY PLUS cwigvYMZ imvqb 385 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES NbgvÎvi gvb Abymv‡i `ªe‡Yi wewfbœ bvg- [w`bvRcyi †evW©. 2015] `ª‡ei cwigvY (†gvj) `ªe‡Yi NbgvÎv `ªe‡Yi bvg `ª‡ei cwigvY (†gvj) `ªe‡Yi NbgvÎv `ªe‡Yi bvg 1.0 1.0 M ‡gvjvi `ªeY 0.001 0.001M ev M 1000 wgwj †gvjvi `ªeY 0.5 0.5 M ev 2 M ‡mwg †gvjvi `ªeY 0.1 0.1 M ev 10 M ‡Wwm †gvjvi `ªeY bigvj `ªeY = 1.0 N, ‡Wwm bigvj `ªeY = 0.1 N 0.01 0.01M ev ‡mwg bigvj `ªeY = 0.5 N, ‡mw›U bigvj `ªeY = 0.01 N 100 M ‡mw›U †gvjvi `ªeY kZKiv mshyw³ ev kZK cÖwZ cwigvYt Item-02 : kZKiv nvi wn‡m‡e `ªe‡Yi NbgvÎv wbY©qt w w t `ª‡ei fi‡K `ªe‡Yi †gvU f‡ii kZKiv iƒ‡c cÖKvk| †hgb- 100 g `ªe‡Y 32 g HCl (32% HCl) w v t `ª‡ei fi‡K †gvU AvqZ‡bi kZKiv iƒ‡c cÖKvk †hgb- 100 ml `ªe‡Y 5g NaOH (5% NaOH `ªeY) v v t `ª‡ei AvqZb‡K `ªe‡Yi †gvU AvqZ‡bi kZKiv iƒ‡c cÖKvk †hgb- 100 cc `ªe‡Y 5 cc Alcohol (5% Alcohol Solution) v w t `ª‡ei AvqZb‡K `ªe‡Yi †gvU AvqZ‡bi f‡ii kZKiv iƒ‡c cÖKvk †hgb- 100 g `ªe‡Y 8 ml H2SO4 (8% H2SO4 Solution) (kZKiv mshyw³ wbY©q)t kZKiv mshyw³ = cÖ`Ë †g․j ev †h․‡Mi AvYweK fi †gvU AvYweK fi 100 Ex.1 wPwb‡Z Kve©‡bi kZKiv cwigvY KZ? mgvavbt wPwbi ms‡KZ- C12H22O11; wPwbi AvYweK fi = 1212 + 122 + 1611= 342 ; % C = 144100 342 = 42.1 Ex.2 gv‡e©jcv_i G Aw·‡Rb Gi kZKiv cwigvY KZ? mgvavbt gv‡e©jcv_‡ii ms‡KZ- CaCO3; gv‡e©jcv_‡ii AvYweK fi = 40 + 12 + 16 3 = 100 mgvavbt %O2 = 163 100 100 = 48 mivmwi gyL¯’ ivLvi gZ wKQz cÖ‡kœvË&i cÖkœ ms‡KZ mgvavb ‡Kb gyL¯’ ivL‡e Zzu‡Zi ùwU‡K cvwbi kZKiv cwigvY KZ? CuSO4. 5H2O %H2O= 518 100 249.5 =36.07 evi evi cÖkœ Av‡m BDwiqv‡Z bvB‡Uªv‡R‡bi kZKiv cwigvY KZ? [CU. 2012-13] NH2–CO–NH2 %N2= 28100 60 =46.7 BDwiqv mv‡i bvB‡Uªv‡Rb wd·W A¨v‡gvwbqvg mvj‡dU G S Gi cwigvY KZ? (NH4)2SO4 % S= 32100 132 =24.25 A¨v‡gvwbqvg mvj‡dU mv‡i S wd·W A¨v‡gvwbqvg dm‡dU G P Gi cwigvY KZ? (NH4)3PO4 % P= 31100 149 =20.8 A¨v‡gvwbqvg dm‡dU mv‡i P wd·W †gvj fMœvsk: `ªe‡Yi †Kvb Dcv`v‡bi ‡gvj fMœvsk nj `ªe‡Y H Dcv`v‡bi †gvj msL¨v I `ªe‡Yi †gvU Dcv`v‡bi †gvj msL¨vi AbycvZ| A I B `ywU Dcv`v‡bi `ªe‡Y A Gi †gvj fMœvsk A B A n n n ,BGi †gvj fMœvsk A B B n n n ¯^iYxq: †gvj fMœvsk ïay gvÎ Dcv`vb mg~‡ni †gvj msL¨vi Dci wbf©ikxj| ZvcgvÎvi Dci wbf©i K‡i bv Ex.1 7 MÖvg bvB‡Uªv‡Rb I 8 MÖvg Aw·‡R‡bi wgkÖ‡Y bvB‡Uªv‡R‡bi †gvj fMœvsk KZ? [SAU. 2014-15] A. 0.7 B. 0.5 C. 0.4 D. 7 8 mwVK DËi: B. 0.5 e¨vL¨v: XN2 = nN2 nN2 + nO2 = 7 28 7 28 + 8 32 = 1 2 = 0.5

386 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES Short Ans Question SAQWRITTEN SUGGESTION BAQ Broad Ans Question cÖkœ-01. 1 †KwR `ªve‡K 1 MÖvg †gvj `ªexf~Z _vK‡j wK ai‡bi `ªeY nq? [BUTex. 2010-11] DËi: †gvjvj `ªeY| cÖkœ-02. `ªe‡Yi †gvjvwiwU ZvcgvÎvi Ici wbf©ikxj †Kb? DËi:S = n V = m V(L) M ‡h‡nZz †gvjvwiwU AvqZb wbf©i Avevi AvqZb ZvcgvÎv wbf©i| VT †gvjvwiwU cÖkœ-03. 0.40M Na3PO4 Gi 20 mL Gi KZ †gvj Na+ Avqb Av‡Q? [RU. 2019-20] DËi : S = n V n = V s 20 1000 0.4 = 0.008; Na3PO4 3Na+ + PO4 3– 1mol 3 mol wewµqv †_‡K cvB, 1mol Na3PO4 †_‡K Na+ cvIqv hvq 3mol 0.008 “ “ “ “ “ 3 0.008 = 0.024 mol REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. 0.98 g H2SO4 e¨envi K‡i 1.0 L Rjxq `ªeY •Zwi Kiv nj| `ªeYwUi NbgvÎv KZ? [DU. 2019-20] A. 0.1 M B. 0.1 m C. 0.01 M D. 0.01 m mwVK DËi: C. 0.01 M e¨vL¨v: S = W MV = 0.98 98 1 = 0.01M 02. 0.1N H2SO4 `ªe‡Yi †gvjvwiwU KZ n‡e? [DU. 2008-09, CVASU:2018-19, CUET. 2010-11] A. M/5 B. M/10 C. M/20 D. ‡KvbwUB bq mwVK DËi: C. M/20 e¨vL¨v: 2 20 0.1 M e N N S e S 03. `ªe‡Yi †gvjvi MvpZ¡ nj- [DU.1999-2000] A. 1000 MÖvg `ªve‡K `ªexf~Z `ª‡ei †gvj msL¨v B. 1000 Nb †m.wg.`ªve‡K `ªexf~Z `ª‡ei ‡gvj msL¨v C. 1000 Nb †m.wg. `ªe‡Y Dcw¯
Z `ª‡ei †gvj msL¨v D. 1000 †gvj `ªve‡K `ªexf~Z `ª‡ei †gvj msL¨v mwVK DËi: C. 1000 Nb †m.wg. `ªe‡Y Dcw¯
Z `ª‡ei †gvj msL¨v JnU 01. nvB‡Wªv‡Rb cvi A·vB‡Wi kZKiv mshyw³- [JnU-Ka. 2016-17] A. H=5.93%, O=94.07% B. H= 59.0%, O=41.0% C. H=53.0%, O=94.07% D. H= 5.5%, O=94.5% mwVK DËi: A. H=5.93%, O=94.07% e¨vL¨v: H2O2 Gi kZKiv mshyw³ H% = 1.0082100 34 = 5.93% O%= 162100 34 = 94.11% 02. †Kvb wgkÖ‡Y 150g AvB‡mv‡cÖvcvBj A¨vj‡Kvnj I 60g cvwb Av‡Q| D³ wgkÖ‡Y A¨vj‡Kvn‡ji †gvj fMœvsk KZ? [JnU. 2015-16] A. 0.626 B. 0.374 C. 0.546 D. 0.474 mwVK DËi: D. 0.474 is approximate Accurate Ans is = 0.4285 e¨vL¨v: nA = 60.064 150 = 2.497, nB = 18 60 = 3.33 n = nA + nB = 2.497 + 3.33 = 5.827 xA = 5.827 2.497 = 0.4285 xB = 5.827 3.33 = 0.5714 JU 01. 250 cc 0.1 M H2SO4 `ªe‡Y KZ MÖvg H2SO4 _v‡K? [JU-A, Set-D. 2019-20] A. 2.45 g B. 2.98 g C. 4.90 g D. 5.42 g mwVK DËi: A. 2.45 g e¨vL¨v: W = SMV 1000 = 0.1 98 250 1000 = 2.45 gm. 02. 250 mL `ªe‡Yi g‡a¨ wK cwigvY Na2CO3 `ªexf~Z _vK‡j Zv Na2CO3 Gi 1.0 †gvjvi `ªeY nq? [JU-D: 2019-20] A. 25.6g B. 26.5g C. 27.6g D. 27.5g mwVK DËi: B. 26.5g e¨vL¨v: W = SMV 1000 = 1 250 106 1000 = 26.5g 03. †KvbwU `ªe‡Yi NbgvÎvi wn‡m‡e mwVK? [JU-D: 2019-20] A. †gvjvwiwU > bigvwjwU > †gjvwjwU B. bigvwjwU > †gvjvwjwU > †gvjvwiwU C. †gvjvwjwU > †gvjvwiwU > bigvwjwU D. †KvbwUB bq mwVK DËi: B. bigvwjwU > †gvjvwjwU > †gvjvwiwU e¨vL¨v: †gvjvwiwU, s = n V = n 1L = `ªexf~Z `ª‡ei †gvj `ªe‡Yi AvqZb (L) †gvjvwjwU, m = n M = `ªexf~Z `ª‡ei †gvj `ªve‡Ki fi (kg) myZivs m¤úK© [1L 0.944 kg] †_‡K eySv hvq, †gvjvwiwU < †gvjvwjwU Avevi, bigvwjwU, N = S e, GB m¤úK© †_‡K †evSv hvq, N > S ev, N = S [hLb e = 1] AwaKvsk †ÿ‡Î, N > S B nq| bigvwjwU > †gvjvwiwU A_¨©vr bigvwjwU > †gvjvwjwU > †gvjvwiwU 04. †h‡Kvb `ª‡e¨i 1.0 †gvjvi Rjxq `ªeY I 1.0 †gvjvj Rjxq `ªe‡Yi NbgvÎvi †ÿ‡Î †KvbwU mwVK? [JU-D, Set-Q. 2019-20] A. †gvjvwiwU > †gvjvwjwU B. †gvjvwjwU > †gvjvwiwU C. †gvjvwiwU = †gvjvwjwU D. †KvbwUB bq mwVK DËi: C. †gvjvwiwU = †gvjvwjwU

CHEMISTRY PLUS cwigvYMZ imvqb 387 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 05. †KvbwU †mwg‡gvjvi `ªeY? [JU-D,Set-C: 2018-19, Kz.‡ev. 2016] A.0.1 M B. 0.5 M C. 0.01 M D. 0.005 M mwVK DËi: B. 0.5 M 06. BDwiqv mv‡i bvB‡Uªv‡R‡bi cwigvY KZ kZvsk? [JU.2017-18; CoU:2013-14] A. 38 B. 48 C. 46 D. 42 mwVK DËi: C. 46 e¨vL¨v: BDwiqvi AvYweK ms‡KZ H2N-CO-NH2 BDwiqvi AvYweK fi =2+14+12+16+14+2 = 60g BDwiqv mv‡i bvB‡Uªv‡R‡bi cwigvY= 60 28 100 =46.66 46% 07. cÖwZ wjUv‡i 5g NaOH _vK‡j `ªeYwUi †gvjvwiwU KZ? [JU: 14-15, DU: 10-11, 06-07] A. 1.25M B. 12.5M C. 0.125M D. 0.25M mwVK DËi: C. 0.125M e¨vL¨v: S = w MV = 5 40 1 = 0.125M 08. Na2CO3 G Na Gi kZKiv mshyw³ n‡”Q- [JU. 12-13] A. 43.4% B. 45.3% C. 11.3% D. †KvbwUB bq mwVK DËi: A. 43.4% e¨vL¨v: 100 43.4 106 23 2 % Na 09. H2SO4G Aw·‡Rb Gi kZKiv mshyw³t [JU.2009-10; RU-2011-12; KU-2011-12] A. 65% B. 33% C. 16% D. 98% mwVK DËi: A. 65% e¨vL¨v: H2SO4G Aw·‡Rb Gi kZKiv mshyw³- 64 100 98 = 65.30 RU 01. 100 mL 0.02 M Na2CO3 `ªeY •Zwi‡Z cÖ‡qvRbxq Na2CO3 Gi cwigvY- [RU. 2019-20] A. 0.106 g B. 0.122 g C. 0.212 g D. 0.221 g mwVK DËi: C. 0.212 g e¨vL¨v: w = MVS 100 = 106 100 0.02 1000 = 0.212 02. Møy‡Kv‡R Kve©‡bi kZKiv cwigvY KZ? [RU. 2014-15; HSTU: 2017-18] A. 40% B. 15% C. 60% D. 30% mwVK DËi: A. 40% e¨vL¨v: Møy‡Kv‡Ri ivmvqwbK ms‡KZ C6H12O6| hvi g‡a¨ 6wU Kve©b we`¨gvb| %C = M 100 Mtotal = 126100 180 = 40% 03. NbgvÎv cÖKv‡ki †Kvb GKKwU ZvcgvÎvi Dci wbf©ikxj bq? [RU. 2014-15; CU:2008-09; RU-Science,Set-1: 2018-19, iv.‡ev. 2017] A. †gvjvwiwU B. †gvjvwjwU C. bigvwjwU D. kZKiv AvqZb mwVK DËi: B. †gvjvwjwU e¨vL¨v: NbgvÎv cÖKv‡ki Rb¨ †gvjvwjwU GKKwU ZvcgvÎvi mv‡_ cwieZ©bkxj bq| KviY, †gvjvwjwU AvqZ‡bi mv‡_ m¤úwK©Z bq, f‡ii mv‡_ m¤úwK©Z| 04. CuSO4.5H2O †Kjv‡m cvwbi kZKiv cwigvY KZ? [RU.2012-13CU.2006-07,KU.2011-12] A. 35.08% B. 36.08% C. 37.08% D. 38.08% mwVK DËi: B. 36.08% e¨vL¨v: %H2O = 36.07 249.5 90 100 CU 01. †Kvb NbgvÎvi GKK bq? [CU-A.2019-20] A. moldm–3 B. ppm C. kJmol–1 D. molality mwVK DËi: C. kJmol–1 02. 25°C ZvcgvÎvq 100 mL `ªe‡Y 5.85 g NaCl `ªexf~Z Av‡Q| `ªeYwUi †gvjvwiwU KZ? [CU-A.2019-20] A. 0.5 M B. 1 M C. 5.58 M D. 10 M mwVK DËi: B. 1 M e¨vL¨v: S = m MV = 5.85 58.50.1 = 1.0 M 03. 1 wjUvi 2N H2SO4 Gi kZKiv mshyw³ nj- [CU. 12-13] A. 98% B. 9.8% C. 49% D. 4.9% E. 19.6% mwVK DËi: B. 9.8% e¨vL¨v: S = % 10 M % = SM 10 = 1 98 10 = 9.8% 04. GK †gvjvj `ªe‡Y †Kvb `ª‡ei 0.5 mole _vK‡j Zv‡Z `ªveK _vK‡e? (CU.2010-2011) A. 1.0 kg B. 0.5 L C. 0.5 kg D. 1.0 L mwVK DËi: C. 0.5 kg e¨vL¨v: m = kg m n W W n 0.5 1 0.5 05. †ebwRb †h․‡M Kve©‡bi kZKiv nvi- [CU.08-09] A. 7.7% B. 10.0% C. 92.3% D. 62.5% mwVK DËi: C. 92.3% e¨vL¨v: ‡ebwR‡bi ms‡KZ- C6H6 AvYweK fi = 12 6 + 1 6 = 72 + 6 = 78 Kve©‡bi kZKiv nvi = 100 78 12 6 = 92.3 06. 1 wK‡jvMÖvg `ªve‡K 1 MÖvg †gvj `ªe `ªexf~Z _vK‡j Zv‡K e‡j? [CU.2006-2007, KU. 2010-11] A. ‡gvjvi `ªeY B. ‡gvjvj `ªeY C.bigvj `ªeY D. m¤ú„³ `ªeY E. Am¤ú„³ `ªeY DËi t B. ‡gvjvj `ªeY KU 01. `ªe‡Yi †gvjvwjwU mgxKiY †KvbwU? [KU. 08-09] A. m = `ª‡ei †gvj msL¨v/`ªve‡Ki fi B. m = `ªve‡Ki fi/`ª‡ei †gvj msL¨v C. m = `ª‡ei †gvj msL¨v/ `ªe‡Yi fi D. m = `ªe‡Yi fi/`ª‡ei †gvj msL¨v mwVK DËi: A. m = `ª‡ei †gvj msL¨v/`ªve‡Ki fi e¨vL¨v: mivmwi msÁv n‡Z| CoU 01. NH2CONH2 †h․‡M bvB‡Uªv‡R‡bi cwigvY [Cm.U:2013-14, CU. 2012-13;BSMRSTU. 2017-18] A. 4.67% B. 46.7% C. 4.6% D. 0.467% mwVK DËi: B. 46.7% e¨vL¨v: % N2 = 100 46.7 60 14 2 IU 01. e·vBU AvKwi‡K Al2O3 Gi kZKiv cwigvY KZ? [IU.2008-2009] A. 73.91% B. 72.31% C. 73.81% D. 73.90% mwVK DËi: A. 73.91% e¨vL¨v: e·vBU = Al2O3 .2H2O=27 2+16 3+36=138 100 73.91 138 102 % Al 2O3 02. mgy‡`ªi cvwbi Av‡cwÿK ¸iæZ¡ 1.03 g| mgy‡`ªi cvwbi 1L †K m¤ú~Y© ev®úxf~Z Kivq Ae‡kliæ‡c 36.4 g jeY c‡o _v‡K| mgy‡`ªi cvwb‡Z KwVb e¯‘i kZKiv mshyw³ KZ? [IU.2008-2009] A. 3.54% B. 5.53% C. 3.53% D. 3.50% mwVK DËi: C. 3.53% e¨vL¨v: m = v = 1.031000 = 1030 g mvgyw`ªK cvwb‡Z KwVb e¯‧i kZKiv cwigvY = 3.53% 1030 36.4 100

388 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES BRU 01. GKwU `ª‡ei 1 kilo mole GKwU `ªve‡Ki 200 kg †Z- `ªexf‚Z K‡i `ªeY •Zix Kiv n‡jv| `ªeYwUi †gvjvwjwU KZ n‡e? [RpU:2013-2014] A. 2 m B. 1 m C. 0.5 m D. 5 m mwVK DËi: D. 5 m e¨vL¨v: `ª‡e¨i †gvj msL¨v `ªve‡Ki fi = 1000 200 = 5 †gvjvwjwU BU 01. wb‡gœi †Kvb NbgvÎvwU AvqZb wbf©i bq? [BU. 2015-16] A. Molarity B. Molality C. Normality D. None mwVK DËi: B. Molality e¨vL¨v: Molarity = `ªe‡Y `ªe, Molality = `ªve‡K `ªe Normality = Molarity Zzj¨ msL¨v ,‡h‡nZz `ªe‡Yi AvqZb cwigvc Kiv nq ZvB †gvjvwiwU I bigvwjwU AvqZb wbf©ikxj| STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION SUST 01. 36 g H2O(M = 18) Ges 96 g CH3OH(M = 32) †gkv‡bv n‡jv| wgkÖYwU‡Z cvwbi †gvj fMœvsk KZ? [SUST. 2007-08] A. 0.6 B. 0.4 C. 0.24 D. 0.83 mwVK DËi: B. 0.4 e¨vL¨v: XH2 O = nH2 O nH2 O + n CH3OH = 36 18 36 18 + 96 32 = 2 2+3 = 0.4 JUST 01. 500 mL AvqZ‡bi †Kvb `ªe‡Y 10.6g Na2CO3 `ªexf~Z _vK‡j H `ªe‡Yi NbgvÎv bigvwjwU‡Z KZ? [JUST-C: 2019-20] A. 0.4 N B. 0.8 N C. 0.2 N D. 0.03 N mwVK DËi: A. 0.4 N 02. weï× cvwbi NbgvÎv (†gvj/wjUvi)- [JUST-B: 2019-20] A. 35.5 B. 55.5 C. 18.0 D. 1.0 mwVK DËi: B. 55.5 e¨vL¨v: weï× cvwbi NbgvÎv = 1000 18 = 55.5 mol/L 03. 20 gm cvwb‡Z 10 gm NaCl wgkv‡j NaCl Gi †gvj fMœvsk KZ? [JUST-A: 2019-20] A. 0.133 B. 0.013 C. 0.143 D. 0.233 mwVK DËi: A. 0.133 e¨vL¨v: †gvj fMœvsk, XA = Dcv`v‡bi †gvjmsL¨v †gvU †gvj msL¨v = 10 58.4 20 18 + 10 58.5 = 0.133 04. 10% Na2CO3 `ªe‡bi †gvjvi NbgvÎv KZ? [JUST-A,Set-Kha 2018-19, w`.‡ev. 2016] A. 0.9344 molL–1 B. 0.9434 molL–1 C. 0.09434 molL–1 D. 9.434 molL–1 mwVK DËi: B. 0.9434 molL–1 e¨vL¨v: 1 0.9434molL 106 10 10 M % 10 S BSMRSTU 01. 300 ml 0.25 M `ªeY •Zwi Ki‡Z wK cwigvY Na2CO3 cÖ‡qvRb? [BSMRSTU-A. 2019-20] A. 8.00 g B. 7.95 g C. 5.30 g D. 10.60 g mwVK DËi: B. 7.95 g e¨vL¨v: W = SMV = 0.3 0.25 106 = 7.95 MBSTU 01. 2.0 †gvj jeY I 3.0 †gvj cvwbi wgkÖ‡Y cvwbi †gvj fMœvsk KZ? [MBSTU-C. 2019-20] A. 1.67 B. 0.4 C. 5.0 D. 0.6 mwVK DËi: D. 0.6 e¨vL¨v: cvwbi †gvj fMœvsk = 3 2 + 3 = 0.6 02. wb‡Pi †Kvb GKKwU ZvcgvÎvi Dci wbf©ikxj? [MBSTU-C2.17-18, BUET. 2008-09] A. †gvj fMœvsk B. †gvjvwjwU C. †gvjvwiwU D. kZKiv fi mshyw³ mwVK DËi: C. †gvjvwiwU e¨vL¨v: ‡gvjvwiwU I bigvwjwU fi I AvqZ‡bi AbycvZ e‡j NbgvÎvi GKK `yBwU ZvcgvÎvi Dci wbf©ikxj| HSTU 01. `ªe‡Yi NbgvÎv cÖKv‡ki GKK bq †KvbwU? [HSTU-A.2017-18] A. ‡gvjvwiwU B. †gvjvwjwU C. bigvwjwU D. Am‡gvjvwiwU mwVK DËi: D. Am‡gvjvwiwU e¨vL¨v: `ªe‡Yi NbgvÎv cÖKv‡ki GKK mg~n nj:- (i) bigvwjwU (ii) ‡gvjvwjwU (iii) ‡gvjvwiwU (iv) ppm BZ¨vw`| PUST 01. 36g Møy‡KvR‡K (C6H12O6, M = 180.2) 64 g cvwb‡Z `ªexf~Z Ki‡j `ªe‡Yi †gvjvwiwU KZ n‡e? [PUST. 2019-20] A. 0.0533 B. 0.200 C. 0.360 D. 3.12 mwVK DËi: D. 3.12 e¨vL¨v: NbgvÎv S = n V 1000 = 36 1000 180 64 = 3.125 mol NSTU 01. 0.25 M H2SO4 Gi NbgvÎv ppm GK‡K KZ n‡e? [NSTU-A. 2019-20] A. 24400 B. 24600 C. 24500 D. 24200 mwVK DËi: C. 24500 e¨vL¨v: ppm = S M 1000 = 0.25 98 1000 = 24500 STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION BUET 01. evMv‡b e¨eüZ GKwU mv‡i 30% dmdivm P2O5 wnmv‡e _v‡K, hv cvwb‡Z `ªeYxq| D³ mv‡i dmdiv‡mi cwigvY KZ? [BUET:2011-2012] A. 6.55% B. 13.1% C. 26.2% D. 30.0% mwVK DËi: B. 13.1% e¨vL¨v: 100 43.66 31 2 16 5 31 2 % P 30% Gi †ÿ‡Î = 43.66 0.30 = 13.1% STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. GKwU †Wwm‡gvjvi `ªe‡Yi NbgvÎv KZ? [MAT. 2015-16, w`.‡ev. 2015] A. 1 M B. 0.1 M C. 0.5 M D. 0.001 M mwVK DËi: B. 0.1 M 02. 500 g cvwb‡Z 2mol Na2CO3 †K `ªexf~Z K‡i GKwU `ªeY cÖ¯‘Z Kiv nj| Gi d‡j H `ªe‡Y 100g cvwb‡Z Na2CO3 Gi cwigvY nj 0.4 mol| GB 0.4mol H `ªe‡Y Na2CO3 Gi †hwU cÖKvk cvq †mwU n‡jv- [MAT.2000-2001] A. †gvjvwiwU B. bigvwjwU C. †gvjvi `ªeY D. †gvjvwjwU mwVK DËi: D. †gvjvwjwU 03. cix¶vMv‡i wb‡Pi †Kvb `ªeYwUi e¨envi me‡P‡q †ekx nq? [DAT- 2018-19] A. †gvjvj `ªeY B. digvj `ªeY C. bigvj `ªeY D. †gvjvi `ªeY mwVK DËi: D. †gvjvi `ªeY e¨vL¨v: cixÿvMv‡i me‡P‡q †ekx e¨eüZ nq †gvjvi `ªeY| Z‡e †gvjvj `ªeY ZvcgvÎvi Dci wbf©i K‡i bv| d‡j †gvjvj `ªeY AwaKZi ï×|

CHEMISTRY PLUS cwigvYMZ imvqb 389 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES CONCEPT 05 imvq‡bi ÿz`ªvwZÿz`ª GKK I GK‡Ki iƒcvšÍi †gvjvwiwU ev †gvjvi NbgvÎv wbY©q- Item-01 : ‡gvjvwiwU ev †gvjvi NbgvÎvq 2 ai‡bi cÖkœ Av‡m-1. % †_‡K †gvjvwiwU ev †gvjvi NbgvÎv ev kw³ gvÎv wbY©q, 2. †gvjvwiwU †_‡K kZKiv (%) GKK wbY©q Sub Item-01 : †gvjvwiwU ev ‡gvjvi NbgvÎv wbY©‡q hw` % _v‡K GENERAL RULES (WRITTEN) 3 in 1 TRICKS & TIPS (TnT) S = m VM 1000 [W = m] 01. (%) W V ; S = % 10 M 02. (%) W W ; S = % 10 M [ = `ªe‡Yi NbZ¡] 03. (%) V V ; S = % 10 M [ = `ª‡ei NbZ¡] 04. (%) V W ; S = % 10 M [ = `ªe‡Yi NbZ¡; = `ª‡ei NbZ¡] MODEL EXAMPLE-01: 5% Na2CO3 `ªe‡Yi gvÎv †gvjvwiwU‡Z KZ? GENERAL RULES (WRITTEN) 3 in 1 TRICKS & TIPS (TnT) Here, 5% Na2CO3 Gi A_© n‡jvNa2CO3 Gi 100ml `ªe‡Yi g‡a¨ 5g Na2CO3 `ªexf~Z Av‡Q| m = 5g ,M = 106, v = 100ml S = m VM 1000= 5 100 106 1000 = 0.47M S = 5 10 106 S = 50 106 = .47M MODEL EXAMPLE-02: 10% H2SO4 `ªe‡Yi kw³ gvÎv †gvjvwiwU‡Z KZ? GENERAL RULES (WRITTEN) 3 in 1 TRICKS & TIPS (TnT) Here, m = 10g , v = 100ml, M = 98 S = m VM 1000= 10 98 100 1000 = 1.02 M S = 10 10 98 S = 100 98 = 1.02 Sub Item-02 : ‡gvjvwiwU †_‡K kZKiv GKK wbY©q ‡gvjvwiwU †_‡K kZKiv GKK wbY©qt 10 SM % M % 10 S EX–01. 1.510–2M NaOH `ªe‡Yi NbgvÎv‡K kZKiv GK‡K cÖKvk Ki? Solve: 0.06 10 1.5 10 40 V W % 2 (Ans. 0.06% W V ) EX–02. 0.1M Na2CO3 `ªeY‡K kZKiv fv‡e cÖKvk Ki? Solve: 1.06 10 0.1 106 10 S M V W % (Ans. 1.06% W V ) EX–03. Na2CO3 Gi AvYweK fi 106| 0.5M †gvjvi Rjxq `ªe‡Yi kZKiv cwigvY KZ? Solve: 5.3 10 0.5 106 10 S M V W % (Ans. 5.3% W V ) Item-02 : ppm, ppb, ppt Gi GKK msµvšÍ mgm¨vppm parts per million = 106 ; ppb parts per billion = 109 ; ppt parts per trillion = 1012 m~² AvqZb GKK ppmv (parts per million by volume) Øviv evqygÛ‡j _vKv M¨vmxq c`v_© I m~² KwVb KYv e¯‧i Dcv`v‡bi NbgvÎv cÖKvk K‡i| †hgb- MÖvg GjvKvq `~wlZ evqy‡Z 50 ppmv Uw·K CO M¨vm _v‡K| Sub Item-01 : ppm GK‡K gvb wbY©q- hw` % _v‡K hw` % _v‡K: Gai‡bi As‡K ïay kZKiv cwigvb‡K 104 Øviv ¸Y Ki‡jB gvb cvIqv qvq| ppm GK‡K gvb = % 104 D`vniYt evZv‡m CO2 Gi NbgvÎv 0.036% (AvqZb kZvsk)| GB gvb ppm GK‡K KZ? mgvavbt ppm GK‡K gvb = % 104 = 0.036 104 = 360

390 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES Abyiƒc fv‡e, ppb (Parts per billion) GK‡K gvb = %107 ; ppt (Parts per trillion) GK‡K gvb = %1010 EX–01. evZv‡m bvB‡Uªv‡R‡bi cwigvb 78%| ppb GK‡K GB gvb KZ? mgvavbt %107 = 78 107 = 7.8 108 EX–02. evZv‡m CO2 Gi cwigvY 0.03%| ppt GK‡K GB gvb KZ? †UKwbK Abyhvqxt ppt GK‡K gvb = %1010 = 0.03 1010= 3.0 108 A_©vr ppm, ppb, ppt GK‡K gvb wbY©‡q hw` % _v‡K Z‡e h_vµ‡g 104 , 107 I 1010 Øviv ¸YKi‡jB mivmwi gvb cvIqv hvq| Sub Item-02: ppm GK‡K gvb wbY©q- hw` % bv _v‡K Gevi hw` % bv _v‡K- Zij wgkªY ev KwVb wgkÖ‡Yi †ejvq w/w NbgvÎv‡K 106 , 109 ev 1012 Øviv ¸Y K‡i h_vµ‡g ppm, ppb Ges ppt GK‡K NbgvÎv cÖKvk Kiv nq| ppm = w W = `ª‡ei IRb (g) `ªe‡Yi IRb (g) 106 = `ª‡ei IRb (g) `ªe‡Yi IRb (g) ppm = w V = `ª‡ei IRb (g) `ªe‡Yi AvqZb (mL) 106 = `ª‡ei IRb (mg) `ªe‡Yi AvqZb (L) = `ª‡ei IRb (g) `ªe‡Yi AvqZb (mL) `ªæZ AsK Kivi Rb¨t ppm = ‡QvU fi eo fi 106 , ppb = ‡QvU fi eo fi 109 , ppt = ‡QvU fi eo fi 1012 Unit Same emv‡Z n‡e †R‡b ivLv fv‡jv: f‡ii †ÿ‡Î- ppm = mg/kg = g/g Ges AvqZ‡bi †ÿ‡Î- ppm = mg/L = g/mL EX–01. 1000g cvwb‡Z 0.01mg Av‡m©wbK `ªexf~Z Ae¯’vq _vK‡j Av‡m©wbK NbgvÎv ppb GK‡K KZ? mgvavbt †UKwbK Abyhvqx- ppm = w W = `ª‡ei IRb (g) `ªe‡Yi IRb (g) 106 S = 0.01 mg 1000 g 10 9 = 0.01 103 g 103 g 109 = 10 ppb EX–02. ‡Kvb WvjWvi 30g bgybv‡K we‡kølY K‡i 0.06mg wb‡Kj cvIqv †Mj| wb‡K‡ji NbgvÎv ppb GK‡K cÖKvk Ki| mgvavbt †UKwbK Abyhvqx- ppm = w W = `ª‡ei IRb (g) `ªe‡Yi IRb (g) 106 S = 0.06 mg 30g 109 = 0.06 103 g 30 103 g 109 = 2ppb EX–03. GKwU cv‡Î 250 mL 5% HNO3 `ªeY Av‡Q| H cv‡Îi `ªe‡Yi NbgvÎv ppm GK‡K wnmve Ki| mgvavbt ppm = w V = `ª‡ei IRb (g) `ªe‡Yi AvqZb (mL) 106 = 5 100 106 = 5 104 ppm Sub Item-03: ppm GKK n‡Z kZKiv GKK wbY©q †UKwbK : ppm = % 104 % = ppm 104 EX–01. †Kvb NaOH `ªe‡Yi NbgvÎv 200ppm n‡j Zv kZKiv GK‡K iƒcvšÍi Ki? Solve: % = ppm gvb 104 = 200 104 = 0.02 Sub Item-4 †gvjvwiwU †_‡K ppm Ges ppm †_‡K †gvjvwiwU wbY©q GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) ppm †_‡K †gvjvwiwU| ppm mgL–1 100 Øviv fvM gL–1 M Øviv fvM M = AvYweK fi molL–1 †gvjvwiwU †_‡K ppm ppm molL–1 M Øviv ¸Y gL–1 1000 Øviv ¸Y mgL –1 / ppm ‡UKwbKt S = ppm GK‡K gvb M 10–3 MODEL EXAMPLE-01: NaOH `ªe‡Yi NbgvÎv 400ppm n‡j Zv †gvjvwiwU‡Z KZ n‡e? GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) 400ppm 400mgL–1 = 400 1000 gL–1 = .40 gL–1 = .40 40 molL–1 [ NaOH Gi AvYweK fi M = 40 ] = 0.01 molL–1 = 0.01M S = ppm GK‡K gvb M 10–3 10 0.01M 40 400 S 3

CHEMISTRY PLUS cwigvYMZ imvqb 391 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES MODEL EXAMPLE-02: 1.510–2M NaOH `ªe‡Yi NbgvÎv ppm GK‡K KZ? GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) 1.5 10–2M = 1.5 10–2molL–1 = 1.5 10–2 40gL–1 [ NaOH Gi AvYweK fi M = 40 ] = 1.5 10–2 40 1000 mgL–1 = 600 mgL–1 = 600 ppm ppm GK‡K gvb = S M 103 = 1.510–2 40103 = 600 Ex–03. 0.02M 100mL HCl `ªe‡Yi gvÎv ppm GK‡K wbY©q Ki? Solve: ppm GK‡K gvb = S M 103 = 0.0236.5103 = 730 [we. `ª.: NbgvÎv †_‡K ppm wbY©‡q AvqZb g~j wbqvgK bq] REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. evZv‡m CO2 Gi NbgvÎv 0.036% (AvqZb kZvsk)| GB gvb ppm GK‡K- [DU.05-06] A. 360 B. 3600 C. 36×106 D. 36×104 mwVK DËi: A. 360 e¨vL¨v: ppm GK‡K gvb = % 104 = 0.036 104 = 360 JnU 01. 20 ppm n‡jv- [JnU-A.2017-18] A. 20 mg.ml-1 B. 20g.L-1 C. 20 g.ml-1 D. 20 mg.L-1 mwVK DËi: C. 20 g.ml-1 , D. 20 mg.L-1 e¨vL¨v: ppm= mg/Kg=g/g=mg/L=g/mL 20ppm= 20mg/kg = 20g/g=20mg/L=20g/mL. 02. 5% NaOH `ªe‡Yi NbgvÎv †gvjvwiwU‡Z KZ? [JU-D, Set-Q. 2019-20; JUD,Set-B: 2018-19; JnU-A.2017-18; IU-A:2017-18] A.1.25M B. 0.25M C. 0.80M D. 1.2M mwVK DËi: A.1.25M e¨vL¨v: S= % 10 M = 40 10 5 = 40 50 = 1.25M 03. †KvbwU mZ¨? [JnU-Ka. 2016-17] A. 1ppm=1mgdm-3 B. 1ppm=1mgL-1 C. 1ppm=1gmL-1 D. me¸‡jv mwVK DËi: D. me¸‡jv e¨vL¨v: 1ppm= 1mgdm-3 =1 mg L-1 = 1gmL-1 JU 01. 0.01M HCl-Gi 100 mL `ªe‡Yi NbgvÎv KZ ppm? [JU-D3.2017-18] A. 375 B. 365 C. 378 D. 393 mwVK DËi: B. 365 e¨vL¨v: ppm GK‡K gvb=SM103 =0.0136.5103 =365ppm RU 01. 1L cvwb‡Z 0.1g NaCl `ªexf~Z _vK‡j ppm GK‡K Dnvi NbgvÎv KZ? [RU-Ka,Set-3: 2018-19] A. 10 B. 1 C. 100 D. 1000 mwVK DËi: C. 100 e¨vL¨v: ppm = 10 100 10 0.1 10 6 3 6 w 02. GKwU bgybvq Ca Gi NbgvÎv 10 ppm| H bgybvi 1 kg-†Z Ca-Gi cwigvY- [RU-C3.2017-18] A. 1.0 mg B. 10 mg C. 100 mg D. 1.0 g mwVK DËi: B. 10 mg e¨vL¨v: 1ppm = 1mg/kg = 1g/g = 1mg/L = 1 g/mL 10ppm=10 mg/kg = 10 mg/g =10mg/L=10g/mL 03. 5%Na2CO3 `ªe‡Yi †gvjvwiwU KZ? [MAT. 2019-20; RU-F3.2017-18, BUET. 2006-07] A. 0.74 M B. 0.89 M C. 0.47M D. 0.98 mwVK DËi: C. 0.47M e¨vL¨v: M M S 0.47 106 % 10 5 10 04. 18M NaOH `ªe‡Yi kZKiv NbgvÎv KZ (w/v)? [RU-G1.2017-18] A.100% B. 18% C. 72% D. 36% mwVK DËi: C. 72% e¨vL¨v: S = % 10 M % = S M 10 = 18 40 10 = 72% 05. 1 ppm =? [RU-H. 2015-16; e.‡ev 2017; wm.‡ev. 2017] A. 1 mg/L B. 0.1 mg/L C. 10 mg/L D. 106 mg/L mwVK DËi: A. 1 mg/L e¨vL¨v: 1 ppm = 1 mg/L, 1ppt = 1g/L 06. GKwU 10% Na2CO3 `ªe‡Yi †gvjvwiwU n‡”QÑ [RU.12-13, SUST.06-07; CU-11-12, JU. 11-12, JnU. 14-15, KUET., RUET. 04-05] A. 0.9434 M B. 0.9938 M C. 9.434 M D. 0.106 M mwVK DËi: A. 0.9434 M e¨vL¨v: S = 0.9434 106 10 10 M % 10 CU 01. 98% weï× H2SO4 (Av‡cwÿK ¸iæZ¡ = 1.80; AvYweK fi = 98) -Gi †gvjvwiwU KZ? [CU-A.2017-18] A. 9.8 M B. 0.98 M C. 1.0 M D. 18 M mwVK DËi: D. 18 M e¨vL¨v: †gvjvi NbgvÎv = 10x M = 10981.8 98 = 18M 02. 20% NaOH `ªe‡Yi †gvjviwU KZ? [CU.2004-2005; IU-A.2017-18] A. 0.1 M B. 2 M C. 4.0 M D. 5 M mwVK DËi: D. 5 M e¨vL¨v: S = 5 40 200 40 20 10 M % 10 KU 01. i‡³ Møy‡Kv‡Ri NbgvÎv 0.005M n‡j, ppm-G KZ n‡e? [KU-A,Set-Kha:2018-19] A. 106 B. 600 C. 900 D. 1060 mwVK DËi: C. 900 e¨vL¨v: ppm = MS103 = 1800.005103 = 900 IU 01. 3.5g f‡ii U¨ve‡j‡U 40.5mg Ca Av‡Q| U¨ve‡j‡U Ca Gi NbgvÎv- [IU-F,Set-B:2018-19] A. 1.065 ppm B. 1.16104 ppm C. 5.6104 ppm D. 116 ppm

392 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES mwVK DËi: B. 1.1610 4 ppm e¨vL¨v: Ca Gi NbgvÎv = 6 3 6 10 3.5 40.5 10 10 ppm W w = 11.57 103 = 1.16 104 CoU 01. †Kv‡bv cvwbi bgybvq `ªexf~Z O2 Gi NbgvÎv 2 10–4 M n‡j ppm GK‡K Gi gvb KZ? [CoU–A. 2019-20] A. 2.0 ppm B. 2.5 ppm C. 4.4 ppm D. 6.4 ppm mwVK DËi: D. 6.4 ppm e¨vL¨v: ppm = SM 103 = 2 10–4 32 103 = 6.4 STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION JUST 01. 0.01 M HCl Gi 100 ml `ªe‡Yi ppm NbgvÎv KZ n‡e? [JUST-A,Set-Kha 2018-19] A. 36.5 ppm B. 365 ppm C. 3.65 ppm D. 3650 ppm mwVK DËi: B. 365 ppm e¨vL¨v: 0.0365 1000 36.5 100 0.01 1000 MVS w g 10 365ppm 100 0.0365 10 V w ppm 6 6 02. 5% NaOH Gi 100 ml `ªe‡Y NaOH Gi cwigvY KZ? [JUST-A,Set-Kha 2018-19] A. 5g B. 40g C. 25 g D. 50 g mwVK DËi: A. 5g e¨vL¨v: 1.25M 40 5 10 M % 10 S g MVS W 1.25 5.0 1000 100 40 1000 03. 200 ml 0.05 M NaOH `ªe‡Y KZ MÖvg NaOH `ªexf~Z Av‡Q? [JUST-A,Set-Kha 2018-19] A. 0.4 g B. 0.5 g C. 0.1 g D. 4 g mwVK DËi: A. 0.4 g e¨vL¨v: W M = VS 1000 W = 40 200 1000 0.05 .4g 04. 0.1 M Na2CO3 `ªe‡Yi NbgvÎv ppm GK‡K KZ? [JUST-B.2017-18, Xv.,h. †ev. 2015] A. 10.6 ppm B. 106 ppm C. 1060 ppm D. 10600 ppm mwVK DËi: D. 10600 ppm e¨vL¨v: ppm NbgvÎv = SM 103 = 0.1 106 1000 = 10600 ppm MBSTU 01. 10% (w/v) H2SO4 `ªe‡Yi NbgvÎv †gvjvwiwU‡Z KZ?[MBSTU-C. 19-20] A. 0.98 M B. 0.102 M C. 9.8 M D. 1.02 M mwVK DËi: D. 1.02 M e¨vL¨v: S = 10x M = 10 10 98 = 1.02 M BSMRSTU 01. 5% (w/v) KOH `ªe‡Yi †gvjvi NbgvÎv KZ? [BSMRSTU-A. 2019-20] A. 1.25 M B. 0.983 M C. 0.893 M D. 0.694 M mwVK DËi: C. 0.893 M e¨vL¨v: S = %10 M = 510 56.1 | KOH Gi AvYweK fi = 39.1+16+1 = 56.1] = 0.893M 02. evZv‡m CO2 Gi NbgvÎv 0.036, GB gvb ppm Unit G KZ? [BSMRSTU:2018-19] A. 360 B. 3600 C. 36106 D. 36104 mwVK DËi: A. 360 e¨vL¨v: ppm = 0.036 × 104 = 360 PUST 01. 0.001 M Na2CO3 `ªe‡Yi NbgvÎv ppm-G KZ? [PUST-B.2017-18] A. 1060 B. 5300 C. 106 D. 10600 mwVK DËi: C. 106 e¨vL¨v: ppm = SM 103 = 0.001 106 103 = 106 HSTU 01. 5× 10-3 g Abv`ª© †mvwWqvg Kv‡e©v‡bU‡K cvwb‡Z `ªexf~Z K‡i 100 ml `ªeY cÖ¯‘Z Kiv n‡jv | ÿvi `ªe‡Yi gvÎv ppm G KZ n‡e? [HSTU-B.2016-17] A. 5 ppm B. 50 ppm C. 500 ppm D. 20 ppm mwVK DËi: B. 50 ppm e¨vL¨v: ppm = w v 106 ev, 510–3 100 106 = 50 ppm STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION RUET 01. wcwcGg (ppm) wK. 10 mL `ªe‡Y 0.4g NaOH Av‡Q| `ªeYwUi NbgvÎv ppm GK‡K cÖKvk Ki| [RUET. 2017-18] e¨vL¨v: †Kvb `ªe‡Yi cÖwZ `k jÿ fv‡M †Kvb `ª‡ei hZ fi `ªexf~Z _v‡K, G fi wb‡`©kK msL¨vwU‡K H `ª‡ei ppm e‡j| `ªeYwUi NbgvÎv , S = w v = 0.4 10 103 gL1 = 40 gL1 = 40 103 mgL1 = 40000 ppm| BUTex 01. 0.1M NaOH `ªe‡Yi NbgvÎv ppm GK‡K KZ n‡e? [BUTex-2016-17] A. 40 ppm B. 400ppm C. 4000ppm D. 1000ppm mwVK DËi: C. 4000ppm e¨vL¨v: ppm =SM 103 = 0.1 40 103 = 4000 02. 0.015M CaCl2 `ªe‡Yi NbgvÎv ppm GK‡K KZ? [BUTex. 2015-16] A. 1665 B. 1600 C. 1650 D. 1690 mwVK DËi: A. 1665 e¨vL¨v: ppm = 103 M S = 103 111 0.015 = 1665 STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. 20% H2SO4 `ªe‡Y cvwbi cwigvY KZ? [MAT. 2015-16] A. 20 gm B. 80 gm C. 100 gm D. 120 gm mwVK DËi: B. 80 gm e¨vL¨v: `ªeY = `ªe + `ªveK 20% H2SO4 K_vwUi A_© n‡jv †Kvb `ªe‡Yi 100ml| AvqZ‡bi g‡a¨ 20g H2SO4 `ªe wn‡m‡e Av‡Q| 100 = 20 + `ªveK `ªveK = 100 – 20 = 80g myZivs cvwb ev `ªve‡Ki cwigvY n‡e 80g. 02. 10% NaCl `ªe‡Yi †gvjvi NbgvÎv n‡e- [MAT. 2014-15] A. 0.1709mol/LB. 1.709 mol/L C. 17.09mol/L D. 170.9mol/L mwVK DËi: B. 1.709 mol/L e¨vL¨v: S = %10 M = 1010 58.5 = 1.709mol/L

CHEMISTRY PLUS cwigvYMZ imvqb 393 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES CONCEPT 06 c¨v_jwRK¨vj GK‡Ki iæcvšÍi m¤úwK©Z mgm¨v GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) (i) m mol/L 103 Øviv fvM –––––––– mol/L (ii) mol/L AvYweK fi Øviv ¸Y –––––––––––––– g/L (iii) g/L 103 Øviv ¸Y –––––––– mg/L (iv) mg/L 10 Øviv fvM –––––––– mg/dL mmol/L mg/dL 18 w`‡q ¸Y mg/dL m mol/L 18 w`‡q fvM Tips: eo gvb †_‡K †QvU gv‡b †h‡Z ¸Y Ki‡Z nq Ges ‡QvU gvb †_‡K eo gv‡b †h‡Z fvM Ki‡Z nq| EX.01t GKRb Wvqv‡ewUm †ivMxi i‡³ Møy‡Kv‡Ri cwigvb 12 m mol/L n‡j mg/dL GK‡K Gi gvb KZ? GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) 12 m mol/L = 12 103 mol/L = 12 180 103 g/L= 12 180 103 mg/L = 12 180 103 10 103 = 216 Møy‡Kv‡Ri cwigvb‡K 18 Øviv ¸b Ki‡jB DËi cvIqv hv‡e| myZivs 1812 = 216 EX.02t GKRb †ivMxi i‡³ Møy‡Kv‡Ri cwigvb 162 mg/dL n‡j m mol/L GK‡K Gi gvb KZ? GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) 162 mg/dL = 162 10 mg/L = 162 10 103 g/L = 162 10 180 103 mol/L = 162 10 103 180 103 m mol/L = 9 m mol/L Møy‡Kv‡Ri cwigvb‡K 18 Øviv fvM Ki‡jB DËi cvIqv hv‡e| myZivs 162 18 = 9 (Ans) REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. GKRb †ivMxi i‡³ Møy‡Kv‡Ri cwigvb 10mmol/L. mg/dL GK‡K Gi cwigvb KZ? [DU.2013-2014,10-11, BSMRSTU-H.2017-18, RU. 2012-13, 2013-14, JU. 2012-13] A. 120 B. 220 C. 200 D. 180 mwVK DËi: D. 180 e¨vL¨v: mg/dL GK‡K gvb = 18 cwigvY = 18 10 = 180 JU 01. i‡³ Møy‡Kv‡Ri cwigvY 8mmol L–1 n‡j mg dL–1 GK‡K Møy‡Kv‡Ri cwigvY KZ? [JU-D, Set-A. 2019-20] A. 148 B. 150 C. 144 D. 152 mwVK DËi: C. 144 e¨vL¨v: mg/dL GK‡K gvb = 18 cwigvY = 18 8 = 144 RU 01. GKRb †ivMxi i‡³ Møy‡Kv‡Ri cwigvY 1 wg.‡gv./wj. n‡j GKwU wg.MÖv/‡W.wj. GK‡K KZ? [RU-H, 2012-13] A. 18 wg.MÖv./‡W.wj. B. 1.8 wg.MÖv./‡W.wj. C. 180 wg.MÖv/‡W.wj. D. 280 wg.MÖv./‡W.wj. mwVK DËi: A. 18 wg.MÖv./‡W.wj. e¨vL¨v: 18 w`‡q ¸Y 1 mmL1 = (1 18) mg/dL = 18 mg/dL CU 01. GKRb †ivMxi i‡³ Møy‡Kv‡Ri cwigvY 8 wgwj‡gvj/ wjUvi| wgwjMÖvg/ †WwmwjUvi GK‡K Gi gvb KZ? [CU.2008-2009] A. 144 B. 140 C. 150 D. 180 mwVK DËi: A. 144 BAU 01. GKRb Wvqv‡ewU‡Ki i‡³ Møy‡Kv‡Ri cwigvY 360 mm/dL n‡j Gi cwigvY mmol/L GK‡K KZ? [BAU. 2013-14] A. 10 B. 15 C. 18 D. 20 mwVK DËi: D. 20 e¨vL¨v: 18 w`‡q fvM 360 mg/dL = 360 18 mm/dm3 = 20 mm/dm3 STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION MBSTU 01. GKwU †ivMxi i‡³ Møy‡Kv‡Ri cwigvY 108 wg.MÖv/ †WwmwjUvi| wgwj‡gvjvi GK‡K Møy‡Kv‡Ri cwigvY KZ n‡e? [MBSTU-C. 2012-13] A. 10.8 wgwj‡gvj/dm3 B. 1.80 wgwj‡gvj/dm3 C. 6 wgwj‡gvj/dm3 D. 5 wgwj‡gvj/dm3 mwVK DËi: C. 6 wgwj‡gvj/dm3 e¨vL¨v: 18 w`‡q fvM 108 mg/dL = 108 18 mm/dm3 = 6 mm/dm3 NSTU 01. GKRb †ivMxi i‡³ Møy‡Kv‡Ri cwigvY 180 wgwjMÖvg/‡WwmwjUvi hv bx‡Pi †KvbwUi mgvb? [NSTU-C. 2009-10] A. 1 wgwj‡gvj/wjUvi B. 100 wgwj‡gvj/wjUvi C. 10 wgwj‡gvj/wjUvi D. 0.1 wgwj‡gvj/wjUvi mwVK DËi: C. 10 wgwj‡gvj/wjUvi e¨vL¨v: 18 w`‡q fvM 180 mg/dL = 180 18 mm/dm3 = 10 mm/L STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. GKRb †ivMxi i‡³ Møy‡Kv‡Ri cwigvY 190 mg/dl n‡j, mmol/L GK‡K Gi gvb KZ? [MAT- 2018-19] A. 9.56 mmol/L B. 10.56 mmol/L C. 8.56 mmol/L D. 12.56 mmol/L mwVK DËi: B. 10.56 mmol/L e¨vL¨v: mmol/L = 18 190 = 10.55

394 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES CONCEPT 07 UvB‡Uªkb, ÷¨vÛvW© c`v_© Ges Av‡qv‡WvwgwZ-Av‡qvwWwgwZ Item-01: cÖvBgvix ÷¨vÐvW© c`v_© : [Xv. †ev. 2017, wm. †ev. 2016] •ewkó¨ D`vniY g‡b ivLvi wUªKm cÖgvY `ªeY (cÖvBgvix ev gyL¨ `ªeY) •Zix‡Z e¨eüZ nq| weï× Ae¯
vq wbw`©ó mshyw³‡Z cvIqv hvq| cvwbZ¨vMx, cvwbMÖvnx ev cvwbMÖvmx bq| evqyi Rjxq ev®ú I RxevYy Øviv AvµvšÍ nq bv| Abv`ª© †mvwWqvg Kve©‡bU (Na2CO3) cvUvwkqvg WvB‡µv‡gU (K2Cr2O7) Av`ª© A·vwjK GwmW (H2C2O4.2H2O) ‡KjvwmZ †mvwWqvg A·v‡jU (Na2C2O4.2H2O) mvKwmwbK GwmW [COOH(CH3)2COOH] ms‡K‡Z hvi g‡a¨ C eY© Av‡Q ‡mB cÖvBgvix ÷¨vÛvW© c`v_©| e¨wZµg- HCl ‡m‡KÐvix ÷vÐvW© c`v_©: G‡`i weï× Ae¯
vq I wbw`©ó mshyw³‡Z cvIqv hvq bv| CO2, O2 M¨vm †kvlY K‡i| ‡KvbwU cvwbMÖvnx Avevi †KvbwU cvwb Z¨vMx RxevYy Øviv AvµvšÍ nq| ivmvqwbK wbw³‡Z mwVK IRb wb‡q cÖgvY `ªeY cÖ¯‧Z Kiv m¤¢e bq| wbw`©ó cwigvY IRb K‡i cÖ‡qvRbxq `ªeY cÖ¯‧Z Kiv hvq| `ªe‡Yi gvÎv cwiewZ©Z nq| D`vniYt Mvp H2SO4, NaOH, KOH, Na2S2O3, KMnO4, HCl cÖf„wZ Item-02: UvB‡Uªkb: AÁvZ NbgvÎvi †Kvb `ªe‡Yi NbgvÎv wbY©‡qi j‡ÿ¨ D³ `ªe‡Yi KZ AvqZ‡bi mv‡_ †Kvb cÖgvY `ªe‡Yi KZ AvqZb wewµqv Ki‡Z cv‡i Zv wbY©q Kivi cixÿv‡K UvB‡Uªkb ejv nq| UvB‡Uªkb 2 cÖKvi| h_v- fiwgwZK UvB‡Uªkb (Kg e¨eüZ nq), AvqZbwgwZK UvB‡Uªkb (me‡P‡q †ewk e¨eüZ nq) UvBUªv›U ev UvBUvi (Titrant or Titre): cÖgvY `ªeY ev ÁvZ NbgvÎvi `ªeYwU‡K UvBUª¨v›U ev UvBUvi e‡j| UvB‡Uªk‡bi mgq GwU‡K mvaviYZ ey¨‡iU †bqv nq| UvB‡UªU ev UvBU¨vÛ (Titrate or Titrand): ARvbv NbgvÎvi `ªeYwU‡K UvB‡UªU ev UvBUª¨vÛ e‡j| GwU‡K mvaviYZ Kwb‡Kj d¬v‡· †bqv nq| UvB‡Uªk‡bi mgvwß we›`y ev cÖkgb we›`y (End Point): UvB‡Uªk‡bi †h Ae¯
vq mswkøó wewµqvwUi cwigvYMZ mgvwß N‡U Zv‡K UvB‡Uªk‡bi mgvwß ÿY ev mgvwß we›`y ev cÖkgb we›`y ejv nq| cÖ‡qvRbxq ivmvqwbK Dcv`vb- (i) cixÿvaxb bgybv `ªeY (ii) cÖgvY `ªeY Ges (iii) wb‡`©kK c`v_© cÖ‡qvRbxq hš¿cvwZ- (i) KwbK¨vj d¬¨v®‥ (ii) wc‡cU Ges (iii) ey¨‡iU UvB‡Uªk‡b wewfbœ e¯‘ e¨env‡ii myweav Amyweavt UvB‡Uªk‡b Av‡qvwWb e¨env‡ii Amyweavt Av‡qvwWb D”P ev®úPv‡ci Kvi‡Y wKQy ev®úxf~Z n‡q hvq| AwZwi³ wKQy gy³ Av‡qvwWb m„wó nq| K2Cr2O7 Øviv UvB‡Uªkbt e¨env‡ii myweav I Amyweavt weï× Ae¯
vq cvIqv hvq Ges MjbvsK w¯
i _v‡K| K2Cr2O7 Gi NbgvÎv eûw`b ch©šÍ AcwiewZ©Z _v‡K| Av‡jvK ev mvaviY •Re †h․M I jNy HCl Øviv WvB‡µv‡gU `ªeY mg~n mn‡R weRvwiZ nq bv| Kÿ ZvcgvÎvq HCl Øviv weRvwiZ nq bv| KMnO4 ¯^wb‡`©kK n‡jI K2Cr2O7 ¯^wb‡`©kK bq| G wb‡`©k‡Ki †ejvq dmdwiK GwmW Aek¨B †hvM Ki‡Z nq| ÷vP© e¨env‡ii Amyweavt ÷vP© VvÛv mvm‡cbm‡b A`ªeYxq| Av‡qvwW‡bi mv‡_ †h RwUj †h․M Drcbœ K‡i Zv wKQzÿY †i‡L w`‡j cvwb‡Z A`ªeYxq n‡q hvq| AwZwi³ `ªe‡Y jNy ÷vP© e¨env‡i mgvwß we›`y ZË¡xq mgvwß we›`y †_‡K wKQyUv wePz¨Z nq| Item-03: Av‡qv‡WvwgwZ-Av‡qvwWwgwZtÑ wewµqvi Wvb cv‡k I2 _vK‡j Av‡qv‡WvwgwZ2CuSO4 + 4KI = Cu2I2 + 2K2SO4+I2 wewµqvi evg cv‡k I2 _vK‡j Av‡qvwWwgwZ- S O I S O I 2 2 4 6 2 2 3 Short Ans Question SAQWRITTEN SUGGESTION BAQ Broad Ans Question cÖkœ-01. Av‡qvwWwgwZ I Av‡qv‡WvwgwZ wK? [RUET. 2015-16] DËi: Av‡qv‡WvwgwZ: †Kv‡bv RviK c`v‡_©i (†hgb : †mvwWqvg _v‡qvmvj‡dU) `ªe‡Yi wbw`©ó Avq‡bi mv‡_ Av‡qvWvBW jeY Gi wewµqvq Drcbœ I2 †K cÖgvY _v‡qvmvj‡dU `ªe‡Yi mvnv‡h¨ UªvB‡Uªkb K‡i gy³ I2 Gi cwigvY wba©viY Kivi c×wZ‡K Av‡qv‡WvwgwZ e‡j| cÖkœ-02. cUvwkqvg WvB‡µv‡gU GKwU cÖvBgvwi ÷¨vÛvW© c`v_©- e¨vL¨v Ki| DËi: cUvwkqvg WvB‡µv‡gU (K2Cr2O7) GKwU cÖvBgvwi ÷¨vÛvW© c`v_© KviY- (i) weï× Ae¯
vq cÖ¯‧Z Kiv hvq, (ii) evZv‡mi ms¯ú‡k© O2, CO2 Rjxq ev‡®úi mv‡_ wewµqv K‡i bv, (iii) IRb †bqvi mgq ivmvqwbK wbw³‡K ÿq K‡i bv, (iv) `ªe‡Yi NbgvÎv `xN©w`b AcwiewZ©Z _v‡K| cÖkœ-03. ÿviag©x UvBUª¨v›U‡K ey¨‡i‡U †bIqv nq bv †Kb? DËi: AvqZwbK we‡kølYKv‡j UvB‡Uªk‡b e¨eüZ cÖgvY `ªeY ev ÁvZ NbgvÎvi `ªeYwU‡K UvBUª¨v›U ev UvBUvi e‡j| UvB‡Uªk‡bi mgq GwU‡K mvaviYZ ey¨‡i‡U †bqv nq| Z‡e ÿviag©x cÖgvY `ªeY h_vm¤¢e ey¨‡i‡U bv †bqvB fv‡jv| KviY ÿviag©x †h․M ey¨‡i‡Ui wmwj‡K‡Ui mv‡_ wewµqv K‡i ey¨‡i‡Ui K¨vwj‡eªkb ev `vM¸‡jv bó Ki‡Z cv‡i| g‡b ivLvi wUªK&m ÔAv‡qvÕ gv‡b Av‡qvwWb Avi Ô†WvÕ gv‡b •Zwi Kiv, A_©vr Av‡qv‡WvwgwZ A_© Av‡qvwWb •Zwi Kiv|

CHEMISTRY PLUS cwigvYMZ imvqb 395 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. _v‡qvmvj‡dU Avqb Av‡qvwWb Øviv RvwiZ n‡j cvIqv hvq- [DU.2007-2008; RU-2016-17, KUET. 2011-12] A.SO3 -2 B. S4O6 -2 C. SO2 D. S2O8 2- mwVK DËi: B. S4O6 -2 e¨vL¨v: _v‡qvmvj‡dU Avqb Av‡qvwWb Øviv RvwiZ n‡j †UUªv_v‡qv‡bU G cwiYZ nq| S O I S O I 2 2 4 6 2 2 3 JU 01. †KvbwU †m‡KÛvwi ÷¨vÛvW© c`v_©? [JU-A.2019-20] A. H2SO4 B. H2C2O4.2H2O C. K2Cr2O7 D. Na2CO3 mwVK DËi: A. H2SO4 02. cÖgvY `ªeY †KvbwU? [JU-A.2019-20] A. 1.0 M Na2CO3 B. 1.0 g H2SO4 C. 1.0 mL H2SO4 D. 1.0 mol H2SO4 mwVK DËi: A. 1.0 M Na2CO3 e¨vL¨v: †h `ªe‡Yi NbgvÎv wbw`©ófv‡e Rvbv _v‡K †mUvB cÖgvY `ªeY| Ackb¸‡jv‡Z ïay A Ack‡bB NbgvÎv †`Iqv Av‡Q myZivs DËi n‡e A| 03. †KvbwU cÖvBgvwi ÷¨vÛvW© c`v_©? [JU-A, Set-A. 2019-20] A. HCl B. NaOH C. KMnO4 D. Na2CO3 mwVK DËi: D. Na2CO3 04. †KvbwU cÖvBgvwi ÷¨vÛvW© c`v_©? [JU-A, Set-D. 2019-20] A. HCl B. NaOH C. KMnO4 D. K2Cr2O7 mwVK DËi: D. K2Cr2O7 05. wb¤œwjwLZ •ewkó¨mg~‡ni †Kvb¸‡jv †m‡KÛvwi ÷¨vÛvW© c`v‡_©i †¶‡Î cÖ‡hvR¨ n‡e? [JU-D. 2016-17] i. weï× Ae¯
vq cvIqv hvq bv| ii. evqy ev Rjxq ev®ú Øviv AvµvšÍ nq bv| iii. cÖK…Z cÖgvY `ªeY‡K msi¶Y Ki‡j `ªe‡Yi NbgvÎv mg‡qi mv‡_ mv‡_ cwiewZ©Z n‡q hvq| A. i I ii B. ii I iii C. i I iii D. i, ii I iii mwVK DËi: C. i I iii 06. cÖgvY `ªe‡Yi Rb¨ †KvbwU cÖvBgvix ÷¨vÛvW© c`v_©? [JU.2011-12,2009-10, P.‡ev. 2017] A.HCl B. H2SO4 C.NaOH D. Na2CO3 mwVK DËi: D. Na2CO3 CU 01. †KvbwU cÖv_wgK cÖgvY e¯‘? [CU-A.2019-20] A. NaCl B. NaOH C. Na2CO3 D. NaNO3 mwVK DËi: C. Na2CO3 02. GKwU cÖv_wgK cÖgvY e¯‘i †Kvb •ewkó¨wU _v‡K bv? [CU. 2019-20] A. Bnv mn‡R `ªexf‚Z nq B. Bnv mn‡R IRb Kiv hvq C. Bnvi NbgvÎv cwiewZ©Z nq bv D. Bnv evqyi Dcw¯
‡Z mn‡R M‡j hvq mwVK DËi: D. Bnv evqyi Dcw¯
‡Z mn‡R M‡j hvq e¨vL¨v: cÖvBgvix ÷vÛvW© `ªe‡Yi wKQz •ewkó¨ n‡jvÑ (i) weï× Ae¯
vq cvIqv hvq| (ii) Bnv mn‡R IRb Kiv hvq| (iii) Bnvi NbgvÎv cwieZ©b nq bv| (iv) evZv‡mi Dcw¯
wZ‡Z NbgvÎv cwieZ©b nq bv| 03. 2CuSO4+Kl=Cu2l2+l2+2K2SO4 wewµqvi †ÿ‡Î wb‡Pi †KvbwU mwVK? [CU-Ka.2016-17; CoU.A, 2016-17 ] A. Cu2+ RvwiZ n‡q‡Q B. I- RvwiZ n‡q‡Q C. I - weRvwiZ n‡q‡Q D. Cu2+ GKwU weRviK mwVK DËi: B. I- RvwiZ n‡q‡Q e¨vL¨v: GLv‡b I – Gi RviY gvb –1 †_‡K 0 n‡q‡Q| A_©vr RviY gvb †e‡o‡Q| ZvB I – weRviK, RvwiZ n‡q‡Q| 04. †KvbwU cÖv_wgK cÖgvY c`v‡_©i •ewkó¨ bq? [CU-G. 2016-17] A. GwU‡K weï× Ae¯
vq cÖ¯‧Z Kiv hvq B. GwUi NbgvÎv `xN©w`b AcwiewZ©Z _v‡K C. GwU cvwb‡Z `ªexf~Z nq bv D. GwU evZv‡mi mv‡_ wewµqv K‡i bv mwVK DËi: C. GwU cvwb‡Z `ªexf~Z nq bv e¨vL¨v: cÖv_wgK cÖgvY `ªeYt cÖvBgvix ÷¨vÛvW© c`v_© n‡Z •Zwi | †hgbt 0.1M Na2CO3, 0.1M H2C2O4.2H2O, 0.1M K2Cr2O7 BZ¨vw`| 05. CuSO4 I KI Gi g‡a¨ wewµqvi d‡j Drcbœ c`v_©¸wj n‡”Q- [CU.2009-2010] A. Cu2I2+K2SO4 B. Cu2I2 + K2SO4+I2 C. CuI+K2S+I2O D. CuI2+K2+I2 E.Cu2+K2SO4+I DËit B. Cu2I2 + K2SO4+I2 e¨vL¨v: CuSO4 + KI = Cu2I2 + K2SO4+I2 06. CuSO4 + Kl wewµqvi cÖavb Drcv`wU wK? [CU.2008-2009] A. Cul2 B. K C. I2 D. CuS E. K2SO4 mwVK DËi: C. I2 e¨vL¨v: 2CuSO4 + 4KI 2K2SO4 +Cu2I2 + I2 IU 01. cÖvBgvix ÷¨vÛvW© c`v_©- [IU-A.2017-18, iv. †ev./h. †ev. 2016] A. K2Cr2O7 B. KMnO4 C. HCl D. Na2S2O3 mwVK DËi: A. K2Cr2O7 e¨vL¨v: ‡h mKj †h․‡M C _v‡K ZvivB cÖvBgvix ÷¨vÛvW© c`v_©| e¨wZµg : HCl DU-7Clg 01. †KvbwU cÖvBgvix ÷¨vÛvW© c`v_© bq? [DU-7Clg. 2019-20] A. Na2CO3 B. NaOH C. K2Cr2O7 D. H2C2O4 mwVK DËi: B. NaOH STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION SUST 01. UvB‡Uªkb wewµqvq †Kvb †h․M w`‡q cÖvBgvix ÷¨vÛvW© `ªeY •Zwi Kiv hvq bv? [SUST-B.2016-17] A. KMnO4 B. A·vwjK GwmW C. Na2CO3 D. NaOH E. K2Cr2O7 mwVK DËi: A. KMnO4 I D. NaOH e¨vL¨v: KMnO4 I NaOH `ywUB †m‡KÛvwi ÷¨vÛvW© c`v_©| JUST 01. †KvbwU cÖvBgvwi ÷vÛvW© c`v_©? [JUST-C.2017-18] A. KMnO4 B. H2SO4 C. Na2S2O3 D. K2Cr2O7 mwVK DËi: D. K2Cr2O7 MBSTU 01. †KvbwU cÖvBgvix ÷¨vÛvW© c`v_©? [MBSTU-B1.2017-18, w`.‡ev. 2015] A. Na2CO3 B. HCl C. KMnO4 D. Na2S2O3 mwVK DËi: A. Na2CO3

396 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES BSMRSTU 01. wb‡Pi †KvbwU †m‡KÛvwi ÷vÛvW© c`v_© bq? [BSMRSTU-H.2017-18] A. C2H2O4 B. HCl C. H2SO4 D. KMnO4 mwVK DËi: A. C2H2O4 e¨vL¨v: ‡h mKj c`v‡_© C _vK‡e Zviv cÖvBgvix ÷vÛvW© c`v_©| e¨vwZµg: HCl 02. KMnO4 GKwU- [BSMRSTU-H.2017-18] A. cÖv_wgK cÖgvY e¯‧ B. ‡m‡KÛvwi cÖgvY e¯‧ C. weRviK c`v_© D. ‡KvbwUB bq mwVK DËi: B. ‡m‡KÛvwi cÖgvY e¯‧ e¨vL¨v: ‡m‡KÛvwi cÖgvY e¯‧ : HCl, H2SO4, NaOH, KOH, KMnO4 STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION BUET 01. †KvbwU cÖvBgvix ÷¨vÛvW© c`v_© bq?[BUET.2012-13 ,CU.2009-2010, e. †ev. 2018, 2016] A. Na2CO3 B. KMnO4 C. Na2C2O4.2H2O D. K2Cr2O7 mwVK DËi: B. KMnO4 02. †KvbwU cÖvBgvix ÷¨vÛvW© c`v_©? [BSMRSTU-C. 2019-20 BUET. 2011-12, BSMRSTU.17-18, P. †ev. 15, w`. †ev. 17] A. KMnO4 B. K2Cr2O7 C. H2SO4 D. Na2S2O3 mwVK DËi: B. K2Cr2O7 STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. bx‡Pi †KvbwU †m‡KÛvix ÷¨vÛvW© c`v_© bq- [MAT.2012-13,CU.2011-2012] A.HCl B. Na2CO3 C. NaOH D. Na2S2O3 mwVK DËi: B. Na2CO3 e¨vL¨v: cÖvBgvix ÷¨vÐvW© c`v_©: Abv`ª© †mvwWqvg Kve©‡bU (Na2CO3), K2Cr2O7, Av`ª© A·vwjK GwmW (H2C2O4.2H2O), †mvwWqvg A·v‡jU, mvKwmwbK GwmW cÖf„wZ| ‡m‡KÛvix ÷¨vÐvW© c`v_©: Mvp H2SO4, NaOH, KOH, Na2S2O3, KMnO4, HCl cÖf„wZ CONCEPT 08 wb‡`©kK I wb‡`©kK wbev©Pb Item–01: wb‡`©kK m¤cwK©Z Z_¨vejx: ‡h mg¯Í c`v_© wb‡Ri eY© cwieZ©b Øviv †Kvb ivmvqwbK wewµqvi mgvwß wb‡`©k K‡i, Zv‡`i‡K wb‡`©kK e‡j| ‡Kvb c`v_©‡K wb‡`©kK wn‡m‡e e¨envi Kivi kZ©mg~n: wb‡`©k‡Ki eY© ¯
vqx I D¾¡j n‡Z n‡e| A¤øxq I ÿviKxq gva¨‡gi e‡Y©i g‡a¨ h‡_ó cv_©K¨ _vK‡Z n‡e| Giv wecixZ e‡Y©i n‡j me‡P‡q fv‡jv nq| wb‡`©k‡Ki eY© nVvr cwiewZ©Z n‡Z n‡e| A_©vr H + Avq‡bi †h NbgvÎvi g‡a¨ wb‡`©k‡Ki eY© cwiewZ©Z nq Zvi we¯Ívi ¯^í n‡Z n‡e| †h wewµqvi †ÿ‡Î wb‡`©kK e¨envi Kiv n‡e, Zvi UvB‡Uªk‡bi mgvcbx we›`y‡Z wb‡`©k‡Ki eY© cwiewZ©Z n‡Z n‡e| wewfbœ cÖKvi wb‡`©kKt wb‡`©kK D`vniY wb‡`©kK D`vniY GwmW-ÿvi wg_vBj A‡iÄ, †dbjd_¨vwjb ‡ZRw¯…q wewfbœ †ZRw¯…q AvB‡mv‡Uvc RviY-weRviY K2Cr2O7 Øviv Fe2+ RviY ¯^-wb‡`©kK KMnO4 Awa‡kvlY bxje‡Y©i BDwmb iÄK wewfbœ gva¨‡g Dchy³ wb‡`©kKt GwmW-ÿvi P H cwimi wb‡`k©K GwmW-ÿvi P H cwimi wb‡`k©K Zxeª GwmW - g„`y ÿvi 3 – 6.5 wg_vBj A‡iÄ I wg_vBj †iW Zxeª GwmW - Zxeª ÿvi 3 – 10 me wb‡`©kK g„`y GwmW - Zxeª ÿvi 8 – 10 †dbjd_¨vwjb g„`y GwmW - g„`y ÿvi 0 †Kvb wb‡`k©K †bB mvaviY wb‡`©k‡Ki eY© cwieZ©‡bi P H Gi cwimi (* wPý¸‡jv ¸i~Z¡c~Y©) wb‡`©kK P H cwimi A¤øxq `ªe‡Y eY© ÿvixq `ªe‡Y eY© wb‡`©kK P H cwimi A¤øxq `ªe‡Y eY© ÿvixq `ªe‡Y eY© *wg_vBj A‡iÄ 3.1 – 4.2 ‡Mvjvcx jvj njy` wµmj †iW 7.2 – 8.8 njy` jvj *wg_vBj †iW 4.2 – 6.3 jvj njy` ‡dbj †iW 6.8 – 8.4 njy` jvj *‡dbd_¨vwjb 8.3 – 10 eY©nxb ‡Mvjvcx *‡eªv‡gv_vBgj eøy 6.0 – 7.6 njy` bxj ‡eªv‡gv †dbj 3.0 – 4.6 njy` bxj wjUgvm 6.0 – 8.0 jvj bxj wg_vBj B‡qv‡jv 2.9 – 4.0 jvj njy` ‡eªv‡gvwµmj MÖxb 3.8 – 4.0 njy` bxj _vBgj eøy 1.2 – 2.8 jvj njy` *m¨vwjRvwib-B‡q‡jv 10.1-12.1 njy` iw³g jvj †R‡b ivLv fv‡jv: euvavKwc ev jvj †cqv‡Ri †Lvmv †_‡K cÖvß wb‡`©kK A¨v‡š
vmvqvwbb| cuvKv Kv‡jvRuv‡gi im wb‡`©kK wn‡m‡e KvR K‡i| Gwm‡Wi gva¨‡g GwU jvj eY© wKš‧ ÿvixq gva¨‡g GwU meyR eY© †`q| cyuBkv‡Ki cvKv dj, cuvKv KigPuv, weU, Kv‡jv Av½yi, KvuPv njy`, jvj euvavKwc, Pv-cvZv †_‡KI wb‡`©kK •Zwi Kiv hvq| * wbDUªvj †iW A¤øxq ev ÿvixq †Kvb gva¨‡g eY© †`q bv|

CHEMISTRY PLUS cwigvYMZ imvqb 397 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. cUvwkqvg cvig¨v½v‡bU-‡mvwWqvg A·v‡jU UvB‡Uªk‡b wb‡gœi †KvbwU Zzwg e¨envi Ki‡e? [DU.2010-2011] A. methyl orange B. starch C. diphenylamine D. no indicator mwVK DËi: D. no indicator e¨vL¨v: †h c`v_© eY© cwieZ©‡bi gva¨‡g Zzj¨Zv we›`y ev mgvwß we›`y wb‡`©k K‡i Zv‡K wb‡`©kK e‡j| Avi UªvB‡Uªkb nq `yB cÖKvi| h_v1| GwmW- ÿviK UvB‡Uªkb; 2| RviY-weRviY UvB‡Uªkb cUvwkqvg cvig¨v½v‡bU-†mvwWqvg A·v‡jU GKwU RviY-weRviY UvB‡Uªkb| e¨eüZ wb‡`©kK: cUvwkqvg cvig¨v½v‡bU w`‡q UvB‡Uªk‡b †Kvb wb‡`©k‡Ki cÖ‡qvRb nq bv KviY KMnO4 Gi eY© AZ¨šÍ Zxeª Ges 100ml cvwb‡Z 0.1ml 0.02 †gvjvi †hvM Ki‡j Gi my¯úó nvjKv wc½j eY© †`Lv hvq| A_©vr cUvwmqvg cvig¨v½v‡bU m¦-wb‡`©kK wn‡m‡e KvR K‡i| JU 01. †Kvb wb‡`©kKwU mej GwmW I mej ÿvi `ªe‡Yi UvB‡Uªk‡b e¨eüZ nq? [JU-D7.2017-18] A. wjUgvm B. wg_vBj A‡iÄ C. ‡dbjd_¨vwjb D. ÷vP© mwVK DËi: Dc‡ii me¸‡jvB mwVK KviY mej GwmW Ges mej ÿv‡ii †ÿ‡Î †h †Kvb wb‡`©kK e¨envi Kiv hvq| 02. GKwU Zxeª GwmW I g„`y ÿviK UvB‡Uªk‡b Dchy³ wb‡`©kK †KvbwU? [JU.2011-2012, MBSTU. 2012-13] A. †dbjd_vwjb B. wg_vBj †iW C. wjUgvm D. †KvbwUB bq mwVK DËi: B. wg_vBj †iW RU 01. wg_vBj A‡iÄ wb‡`©k‡Ki pH cwimi KZ? [RU-Science,Set-1: 2018-19, SUST-B,2018-19, BUET. 2013-14] A. 1.1 – 3.1 B. 3.1 – 4.4 C. 2.1 – 3.1 D. 2.1 – 4.4 mwVK DËi: B. 3.1 – 4.4 02. Rjxq `ªe‡Y ‡dbd_¨vwjb wb‡`k©‡Ki eY© cwieZ©‡bi pH cwimi- [RU-C3.2017-18; CU.2019-10; JU-D, 2019-20; wm. †ev.16, e. †ev.15+16] A. 4.0 – 6.0 B. 6.5 – 8.5 C. 8.3 – 10.0 D. 5.5 – 7.0 mwVK DËi: C. 8.3 – 10.0 03. †g․gvwQ ûj †dvUv‡j ÿZ¯’v‡b wb‡Pi †KvbwU e¨envi Kiv nq? [RU-F3.2017-18] A. KwjPzb B. wf‡bMvi C. Lvevi jeb D. cvwb mwVK DËi: A. KwjPzb 04. wb‡Pi †Kvb wb‡`©kK c`v_©wU A¤øxq gva¨‡g eY©nxb? [RU-F3.2017-18] A. †dbj †iW B. wg_vBj †iW C. wµmj †iW D. †dbjd&_¨vwjb mwVK DËi: D. †dbjd_¨vwjb e¨vL¨v: †dbjd_¨vwjb A¤øxq gva¨‡g eY©nxb wKš‧ ÿvixq gva¨‡g jvj‡P †e¸wb e‡Y©i| wµmj †iW I †dbj †iW A¤øxq gva¨‡g njy` Ges ÿvixq gva¨‡g jvj e‡Y©i| wg_vBj †iW A¤øxq gva¨‡g jvj Ges ÿvixq gva¨‡g njy` e‡Y©i| 05. NaOH Øviv CH3COOH †K UvB‡Uªk‡bi Rb¨ Dchy³ wb‡`©kK nj; [RU.2009-2010] A. †dbd_¨vwjb B. wg_vBj A‡iÄ D. wg_vBj †iW D. †h †Kvb wb‡`©kK mwVK DËi: A. †dbd_¨vwjb 06. Zxeª GwmW I g„`y ÿv‡ii cÖkg‡b †Kvb wb‡`©kK e¨eüZ nq? [RU.2008-09, JUST-A.2016-17, CU. 2003-04] A. wjUgvm B. wg_vBj A‡iÄ C. †dbd_¨vwjb D. _vBgj eøy mwVK DËi: B. wg_vBj A‡iÄ e¨vL¨v: Zxeª GwmW I g„`y ÿv‡ii Rb¨ ÿvixq wb‡`©kK e¨eüZ nq ‡hgb- wg_vBj A‡iÄ I wg_vBj †iW| g„`y GwmW I Zxeª ÿv‡ii Rb¨ GwmwWq wb‡`©kK e¨eüZ nq †hgb- †dbd_¨vwjb| Zxeª GwmW I Zxeª ÿv‡ii Rb¨ †h‡Kvb wb‡`©kK e¨eüZ nq| 07. wb‡`k©K wn‡m‡e †Kvb ai‡bi UvB‡Uªk‡bi †ÿ‡Î wg_vBj †iW Dc‡hvMx? [RU.2008-2009] A. Zxeª GwmW I Zxeª ÿvi B. Zxeª GwmW I g„`y ÿvi C. g„`y GwmW I Zxeª ÿvi D. g„`yGwmW I g„`y ÿviK mwVK DËi: B. Zxeª GwmW I g„`y ÿvi e¨vL¨v: Chart Gi e¨vL¨v †`L| 08. wg_vBj †iW ÿvixq `ªe‡Y wK eY© †`q? [RU.2007-08] A. bxj B. Kgjv C. njy` D. jvj mwVK DËi: C. njy` e¨vL¨v: wg_vBj †iW ÿvixq `ªe‡Y njy` Ges A¤øxq `ªe‡Y jvj eY© †`q| 09. wg_vBj A‡iÄ A¤øxq `ªe‡Y †Kvb eY© aviY K‡i? [RU. 2011-12, 2007-08] A. njy` B. Kgjv C. †Mvjvcx jvj D. meyR mwVK DËi: C. †Mvjvcx jvj e¨vL¨v: wg_vBj A‡iÄ A¤øxq `ªe‡Y †Mvjvcx jvj eY© ‡`q Ges wg_vBj A‡iÄ ÿvixq `ªe‡Y njy` eY© ‡`q| CU 01. cUvwkqvg cvig¨v½v‡b‡Ui `ªeY‡K †mvwWqvg A·v‡j‡Ui `ªeY Øviv UvB‡Uªk‡bi Rb¨ Dchy³ wb‡`©kK | [CU. 2014-15] A. †dbjd_¨vwjb B. wg_vBj A‡iÄ C. wgDi·vBW D. ÷vP© E. †Kvb wb‡`©k‡Ki cÖ‡qvRb †bB mwVK DËi: E. †Kvb wb‡`©k‡Ki cÖ‡qvRb †bB e¨vL¨v: cUvwkqvg cvig¨v½v‡bU `ªeY‡K ‡mvwWqvg A·v‡jU `ªeY Øviv UvB‡Uªk‡bi Rb¨ †Kvb wb‡`©kK cÖ‡qvRb †bB| KviY GB †¶‡Î cUvwkqvg cvig¨v½v‡bU wb‡RB wb‡`©kK wnmv‡e KvR K‡i| KU 01. NaOH + CH3COOH wewµqvq Dchy³ wb‡`©kK †KvbwU? [KU-C.2019-20] A. wg_vBj †iW B. wg_vBj A‡iÄ C. _vBgj eøy D. †dbjd_¨vwjb mwVK DËi: D. †dbjd_¨vwjb e¨vL¨v: mej ÿvi I `ye©j Gwm‡Wi wewµqvq cÖkgb we›`y mvaviYZ pH = (8-10) Gi g‡a¨ _v‡K ZvB wewµqvq Dchy³ wb‡`©kK wn‡m‡e †dbd_¨vwjb| STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION JUST 01. †KvbwU wg_vBj A‡iÄ wb‡`©k‡Ki eY© cwieZ©‡bi pH †iÄ? [JU-D, Set-A. 2019-20; JUST. 2019-20] A. 3.1 – 4.4 B. 4.1 – 5.4 C. 6.1 – 7.4 D. †KvbwUB bq mwVK DËi: A. 3.1 – 4.4 STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION Tex.Eng.Clg. 01. CH3COOH + NH4OH What type of indicator is used in this neutralization ration [Tex.Eng.Clg. 2019-20] A. methyl organge B. methyl red C. Thaimol blue D. none of them mwVK DËi: D. none of them e¨vL¨v: CH3COOH I NH4OH are weak acid and weak bease, respectively. No one indicator can be used for their titration. Mixture of Phenolphthalein and Methyl red may be used.

398 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. g„`y GwmW I mej ÿv‡ii UvB‡Uªk‡b e¨eüZ wb‡`©kK †KvbwU? [MAT.2017-18; KU:2011-12; BSMRSTU:16-17] A. wjUgvm B. †dbd_¨vwjb C. wg_vBj A‡iÄ D. wg_vBj †iW mwVK DËi: B. †dbd_¨vwjb 02. †KvbwU mZ¨ bq? [MAT.2016-17] A. wjUgvm A¤øxq gva¨‡g jvj eY© aviY K‡i B. wg_vBj †iW A¤øxq gva¨‡g jvjeY© aviY K‡i C. †dbj †iW A¤øxq gva¨‡g jvj eY© aviY K‡i D. _vBgj eøy A¤øxq gva¨‡g jvj eY© aviY K‡i mwVK DËi: C. ‡dbj †iW A¤øxq gva¨‡g jvj eY© aviY K‡i 03. wb‡gœi †KvbwU pH Gi cwieZ©‡bi mv‡_ is cwieZ©b K‡i bv? [MAT.2011-12] A. †dbj †iW B. wbDUªvj †iW C. †eªv‡gv‡dbjd_¨vwjb D. wg_vBj fv‡qv‡jU mwVK DËi: B. wbDUªvj †iW e¨vL¨v: wbDUªvj †iW A¤øxq ev ÿvixq †Kvb gva¨‡gB eY© ‡`q bv| 04. wb‡gœi †KvbwU †dbj †iW- Gi eY© cwieZ©‡b pH Gi cwimi? [MAT.2010-11] A. 6.8 8.4 B. 8.3 10.0 C. 3.8 5.4 D. 3.1 4.4 mwVK DËi: A. 6.8 8.4 CONCEPT 09 †gvj msL¨v m¤úwK©Z mgm¨v ïf`„wót ‡Zvgv‡`i Gevi GKwU Kvwikgv †`Lv‡ev| A‡bK ¸‡jv m~‡Îi AsK‡K GKwU Kgb m~‡Îi gva¨‡g cÖKvk K‡i RwUj I `~iæn AsK ¸‡jv wKfv‡e K‡qK †m‡K‡Û Kiv hvq jÿ¨ K‡iv| †mRb¨ †Zvgv‡`i `ywU welq eyS‡Z n‡e| Zzj¨msL¨v (e) [Zzj¨ msL¨v †Zvgiv CONCEPT-01 G wk‡L‡Qv] †gvj msL¨v (n) ‡gvj msL¨v (n) wbY©qt cÖ‡kœ hv †`Iqv Av‡Q Zvi Dci wfwË K‡i m~Î cÖ‡qvM Ki‡Z n‡e| hv †`Iqv _vK‡j m~Î D`vniY (i) fi †`Iqv _vK‡j †gvj msL¨v = cÖ`Ë fi ‡gvjvi fi A_©vr n = m M 72g cvwb‡Z KZ †gvj cvwb Av‡Q? mgvavbt 72g H2O = 72 18 = 4 mol H2O (ii) AYy ev cigvYyi msL¨v †`Iqv _vK‡j †gvj msL¨v, n = cÖ`Ë Aby ev cigvbyi msL¨v A¨v‡fv‡M‡Wªvi msL¨v = X NA 2×1016 wU nvB‡Wªv‡Rb cigvby‡Z KZ †gvj nvB‡Wªv‡Rb cigvby n‡e? mgvavbt n = 2×1016 6.023×1023 =3.32×10-8 †gvj cigvby H (iii) cÖgvY ZvcgvÎv I Pv‡c M¨v‡mi AvqZb †`Iqv _vK‡j ‡gvj msL¨v = cÖ`Ë AvqZb (wjUvi GK‡K) 22.4 A_©vr n = V (L) 22.4 cÖgvY ZvcgvÎv I Pv‡c 250 ml CO2 M¨v‡m KZ †gvj CO2 M¨vm Av‡Q? mgvavbt n = 0.250 22.4 = 0.0112 mol CO2 gas (iv) ‡gvjvwiwU I AvqZb †`Iqv _vK‡j Avgiv Rvwb, ‡gvj msL¨v = wjUv‡i AvqZb × ‡gvjvwiwU‡Z NbgvÎv A_©vr n = V (L) × S 250 ml 2M NaOH `ªe‡Y KZ †gvj NaOH Av‡Q? mgvavb t n = VS = 0.250 × 2 = 0.5 mol NaOH (v) ‡h †Kvb ZvcgvÎv I Pv‡c M¨v‡mi AvqZb †`Iqv _vK‡j n = PV RT mZK© ms‡KZt me ivwki gvb GKB GK‡K n‡e| 27° C ZvcgvÎv I 750 mm cvi` Pv‡c 250 cm3 H2 M¨v‡m H2 Gi †gvj msL¨v KZ? mgvavbt n = PV RT ; n = 0.082 300 0.987 0.25 = 0.01 Dc‡ii K_v¸‡jv (5wU m~·K) Gevi GKev‡K¨ Kgb m~ÎvKv‡i cÖKvk- n = m M = X NA = VL(STP) 22.4 = VL(SATP) 24.78 = VS = PV RT GB ms‡hv‡Mi gva¨‡g cÖvq me AsK Kiv hvq| Gevi D`vniY jÿ¨ Ki Avi g‡b g‡b m~‡Îi ms‡hvM eySvi †Póv Ki? Ex-1. 22g CO2 Gi AYyi msL¨v KZ? mgvavbt fi I cigvYyi msL¨vi g‡a¨ m¤ú©Kt m M = X NA X = m M NA = 22 44 6.023 1023 = 3.01 1023 Ex-2. cÖgvY Ae¯’vq 1.7g NH3 M¨v‡mi AvqZb KZ? mgvavbt fi I AvqZ‡bi g‡a¨ m¤úK© : m M = V (L) 22.4 V(L) = 1.7 17 22.4 = 2.24 Ex-3. 500 ml H2SO4 `ªe‡Y 50g H2SO4 `ªexf~Z Av‡Q| `ªe‡Yi NbgvÎv KZ? [iv. †ev. 2017] mgvavbt m M = VS S = 50 0.5 98 = 50 49 S = 1.02 Ex-4. CaCO3 †h․MwUi †gvjvi fi 100g mol-1 | 10g CaCO3 Zvc cÖ‡qvM K‡i we‡qvwRZ Kiv n‡j †h cwigvY M¨vm Drcbœ nq, 27C ZvcgvÎvq I 1 evqygÛj Pv‡c Zvi AvqZbmgvavbt m M = PV RT V = 10 0.0821 300 100 1 = 0.8 3 = 2.4 L [R = 0.0821 0.08] [wet`ªt †Zvgiv g‡b ivL‡e, G Aa¨v‡q As‡Ki Rb¨ †Zvgv‡`i †mB cwiwPZ mgwš^Z m~Î LyeB cÖ‡qvRb| Zv bv n‡j †Zvgiv wec‡` co‡e| Gevi cÖgvY Kwi P‡jv Xvwe, ey‡qU mn mKj wek¦we`¨vj‡qi cÖ‡kœvËi Dc‡ii GK ev‡K¨ mgvavb Kiv hvq wK bv?]

CHEMISTRY PLUS cwigvYMZ imvqb 399 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. wb‡Pi †KvbwU‡Z †ewk cigvYy Av‡Q? [DU,Unit-A:2018-19] A. 1.10 g of hydrogen atoms B. 14.7 g of chromium atoms C. 2.0 g of helium atoms D. 7.0 g of nitrogen atoms mwVK DËi: A. 1.10 g of hydrogen atoms e¨vL¨v: 1mol 1.1 1.1 nH2 ; 0.28mol 52 14.7 nCr n mol He 0.5 4 2 ; 0.5mol 14 7 nN2 ‡h‡nZz H2Gi †gvj msL¨v me‡P‡q †ekx, ZvB G‡Z me‡P‡q †ekx msL¨K cigvYy we`¨gvb| 02. cÖgvY Ae¯’vq 10.0Lwg‡_b M¨v‡m AYyi msL¨v KZ? [DU-Ka.2017-18] A. 2.6891023 B. 26.891023 C. 0.26891023 D. 26.891025 mwVK DËi: A. 2.6891023 e¨vL¨v: NA X = 22.4 V X = 22.4 VNA = 22.4 10 6.02 1023 = 2.681023 03. 10.0g Aw·‡R‡b AYyi msL¨v KZ? [DU. 12-13; DU-2007-08] A. 3.761023 B. 6.021022 C. 9.631023 D. 1.881023 mwVK DËi: D. 1.881023 e¨vL¨v: A A N M m x N x M m A A N M m x N x M m = 32 10 6.0231023 = 1.881023 04. 18g Møy‡KvR AYy‡Z KZwU Kve©b cigvYy Av‡Q?[DU.2010-2011; BSMRTU-2017-18] A. 6.01023 B. 3.61023 C. 6.01022 D. 3.61024 mwVK DËi: B. 3.61023 e¨vL¨v: A A N M m x N x M m A A N M m x N x M m = 23 6.023 10 180 18 = 6.0231022 C6H12O6 ‡Z Kve©b cigvYyi msL¨v = 6.02310226 = 3.61023 05. 2.00g NaOH, 50.00mL `ªe‡Y `ªexf~Z _vK‡j H NaOH `ªe‡Yi †gvjvwiwU KZ? [DU.2010-2011] A.0.10M B. 0.50M C. 1.00M D.2.00M mwVK DËi: C. 1.00M e¨vL¨v: m = MVS S = M MV m 1 40 0.05 2.00 06. CaCO3 †h․MwUi †gvjvi fi 100g mol-1 | 10g CaCO3 Zvc cÖ‡qvM K‡i we‡qvwRZ Kiv n‡j †h cwigvY M¨vm Drcbœ nq, Kÿ ZvcgvÎvq I 1 evqygÛj Pv‡c Zvi AvqZb- [DU.09-10] A. 2446mL B. 240mL C. 24mL D. 0.24mL mwVK DËi: A. 2446 mL e¨vL¨v: RT PV M m V = 100 1 10 0.0821 298 = 2.44658 L = 2446.58ml 07. 7.1 MÖvg †K¬vwi‡bi g‡a¨ KZ †gvj Cl2 i‡q‡Q? [DU.2009-2010] A. 0.1 mol B. 1.0 mol C. 0.2 mol D. 0.4 mol mwVK DËi: A. 0.1 mol e¨vL¨v: n = mol M m 0.1 71 7.1 08. 200mL 0.075M `ªeY •Zix‡Z wK cwigvY Na2CO3 cÖ‡qvRb? [DU.2009-10, JU-A. 2016-17] A. 1.59g B. 10.60 g C. 2.18 g D. 0.53g mwVK DËi: A. 1.59g e¨vL¨v: n = VS m M = VS m = MVS = 1060.2000.075 = 1.59g 09. 300 mL 0.25M `ªeY •Zwi Ki‡Z wK cwigvY Na2CO3 cÖ‡qvRb n‡e? [DU.2008-09;NU.2013-14] A. 8.44 g B. 7.95 g C. 5.30 g D. 10.60 g mwVK DËi: B. 7.95 g e¨vL¨v: VS M m m = MVS = 1060.3000.25 = 7.95 10. KwóK †mvWv `ªe‡Yi cÖwZ wjUv‡i 5gm NaOH _vK‡j `ªeYwUi †gvjvwiwU KZ? [DU.2006-2007] A. 1.25 M B. 12.5M C. 0.125 M D. 1.52 M mwVK DËi: C. 0.125 M 0.125 M e¨vL¨v: n = vs vs M m S = 40 1 5 Mv m = 0.125M 11. 1.8g cvwb‡Z KZ¸‡jv cvwbi AYy i‡q‡Q? [DU. 2004-05; CU-2006-07] A. 60.23×1023 B. 0.6023×1022 C. 6.023×1022 D. 6.023×1023 mwVK DËi: C. 6.023×1022 e¨vL¨v: m M = X NA X = (1.8/18)× 6.023 × 1023= 6.023 × 10 22 12. 24.5 gm H2SO4 G KZ †gvj Av‡Q? [DU.2000-01] A. 2.5 mol B. 0.25 mol C. 0.025 mol D. 25 mol mwVK DËi: B. 0.25 mol e¨vL¨v: n = m M = 24.5 98 = 0.25 13. 10 gm cvwbi AYyi msL¨v †Kvb msLvwUi KvQvKvwQ? [DU.1999-2000] A. 10 B. 105 C. 10 22 D. 1035 mwVK DËi: C. 1022 e¨vL¨v: m M = X NA x = m M NA x = 10 18 6.0231023 = 3.3461023 mZK©t KvQvKvwQ gvbB DËi 14. 1.06gm Abv`ª© Na2CO3 250mL cvwb‡Z `ªexf~Z Ki‡j `ªeYwUi NbgvÎv KZ n‡e? [DU.1998-1999] A. 0.01 M B. 0.1 M C. 0.2 M D. 0.04 M mwVK DËi: D. 0.04 M e¨vL¨v: S = MV m = 106 0.250 1.06 = 0.04M 15. 500 cm3 0.1M NaOH `ªeY •Zwi Ki‡Z wK cwigvY NaOH jvM‡e? [DU.98-99, BUET. 2003-04] A. 20gm B. 40gm C. 2gm D. 4gm mwVK DËi: C. 2gm e¨vL¨v: M m = VS m = MVS = 400.5000.1 = 2 16. GK †gvj H2O ‡Z we`¨gvb cigvYyi msL¨v- [DU.1998-1999] A. 3 B. 6.02×1023 C. 18.03×1023 D. 12.04×1022 mwVK DËi: B. 6.02×1023 e¨vL¨v: NA X n X = nNA = 6.0231023

400 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES JnU 01. STP-†Z GKwU Aw·‡Rb AYyi AvqZb KZ wjUvi? [JnU. 2015-16] A. 7.44 10–23 B. 2.6510–23 C. 5.31 10–23 D. 3.7210–23 mwVK DËi: D. 3.7210–23 e¨vL¨v: STP †Z O2 M¨v‡mi 1 wU AYyi `LjK…Z AvqZb V 22.4 = X NA V = 1 6.023 1023 22.4 = 3.72 10–23 02. 95% weï× 1 †KwR Pzbvcv_i‡K m¤ú~Y©©iƒ‡c we‡qvwRZ Ki‡j cÖgvY DòZv I Pv‡c KZ wjUvi CO2 Drcbœ n‡e? [JnU. 2015-16] A. 102.8 B. 212.8 C. 112.8 D. 202.8 mwVK DËi: B. 212.8 e¨vL¨v: CaCO3 CaO + CO2 W = 1kg Gi 95% = 0.95kg m~Î, 100 22.4 100 95 1000 22.4 V V M W V = 212.8 L 03. 12.0 L AvqZ‡bi GKwU M¨vm wmwjÛv‡i 23˚C ZvcgvÎvq Ges 7.08 atm Pv‡c nvB‡Wªv‡Rb M¨vm ivLv Av‡Q| wmwjÛv‡i KZ †gvj nvB‡Wªv‡Rb M¨vm Av‡Q? [JnU. 2014-15] A. 2.45 mol B. 3.45 mol C. 4.45 mol D. 5.45 mol mwVK DËi: B. 3.45 mol e¨vL¨v: n = PV RT = 7.0812 0.0821296 = 3.49 mol [Alawys choose the nearest option] 04. GK MÖvg nxi‡K KqwU Kve©b cigvYy _v‡K? [JnU:2013-2014, CU. 2008-09, HSTU. 2012-13] A. 5.0210–22 wU B. 5.021022 wU C. 5.021023 wU D. 5.0210–23 wU mwVK DËi: B. 5.021022 wU e¨vL¨v: NA x M m ev 23 6.023 10 x 12 1 ev x = 5.021022 JU 01. 1.0g nvB‡Wªv‡R‡b KZwU cigvYy Av‡Q? [JU-D: 2019-20; RU. 2014-15,IU-14-15, CU. 13-14] A. 5.04 1022 B. 6.022 1023 C. 5.974 1022 D. 6.022 1022 mwVK DËi: B. 6.022 1023 02. STP †Z 64 g O2 M¨v‡mi AvqZb KZ? [JU-A, Set-A. 2019-20] A. 22.4 L B. 44.8 L C. 67.2 L D. 89.6 L mwVK DËi: B. 44.8 L e¨vL¨v: V = 22.4 64 32 = 44.82 L 03. 28 g N2 M¨v‡m cigvYy msL¨v KZ? [JU-A, Set-D. 2019-20] A. 6.0231023 B. 1.20461023 C. 1.20461024 D. 3.01151023 mwVK DËi: C. 1.20461024 e¨vL¨v: 1 mol = 28g N2 G AYyi msL¨v NA = 6.023 1023wU N2 G cigvYyi msL¨v NA = 2 6.023 1023 = 1.20461024wU 04. †mvwWqvg cigvYyi fi KZ? [JU-D, Set-A. 2019-20] A. 2.8210–3 g B. 3.8210–23 g C. 1.8210–23 g D. 4.8210–23g mwVK DËi: B. 3.8210–23 g e¨vL¨v: m M = x NA m = 1 6.023 1023 23 = 3.82 1023 05. i‡³ †Kv‡j‡÷i‡ji NbgvÎv 0.005 M n‡j 750 mL i‡³ †Kv‡j‡÷i‡ji cwigvY KZ MÖvg? [JU-D1.2017-18] A. 1.4475 B. 1.3925 C. 1.3092 D. 1.3135 mwVK DËi: A. 1.4475 e¨vL¨v: ‡Kv‡j‡÷i‡ji ms‡KZ C27H46O Ges AvYweK fi = 12 27 + 1 46 + 16 = 386 g W = V(L)SM = 0.75 0.005 386 = 1.447g 06. Av`k© ZvcgvÎv I Pv‡c 84 MÖvg N2 M¨v‡mi AvqZb KZ wjUvi? [JU-D1.2017-18] A. 22.4 B. 44.8 C. 67.2 D. 89.6 mwVK DËi: C. 67.2 e¨vL¨v: 22.4 V 28 84 22.4 V M m v = 67.2 07. 2.00 MÖvg H2O †Z KZwU nvB‡Wªv‡Rb cigvYy Av‡Q? [JU-A. 2016-17] A. 1.3384×1023 wU B. 6.669×1022 wU C. 21.33841022 wU D. 6.0231023wU mwVK DËi: B. 6.669×1022 wU e¨vL¨v: W M = X NA ; 22 23 6.669 10 6.023 10 X 18 2 wU 08. 15gm A¨vwmwUK Gwm‡W KZwU Aw·‡Rb cigvYy Av‡Q? [JU.2010-2011] A. 6.023×1023 B. 3.012×1023 C. 3.012×1024 D. 2 mwVK DËi: B. 3.012×1023 e¨vL¨v: NA x M m x = m M NA x = 60 15 6.0231023 = 1.51023 CH3 COOH Aw·‡Rb cigvYyi msL¨v = 2 1.51023 =3.012×1023 09. Kve©b-WvB-A·vB‡Wi 3.0 1023 msL¨K AYyi fi KZ? [JU.2009-2010] A. 22g B. 44g C. 66g D. 88g mwVK DËi: A. 22g e¨vL¨v: NA X M m 23 23 6.023 10 3.0 10 44 m =21.912522g 10. 0.55 L 0.12 M NaCl `ªeY cÖ¯‘Z Ki‡Z KZ MÖvg NaCl Gi cÖ‡qvRb? [JU.2009-2010] A. 58.5g B. 117g C. 2.00g D. 4.00g mwVK DËi: D. 4.00g e¨vL¨v: VS M m ev, m = MVS ev, m = 58.5 0.55 0.12 = 3.864.00 11. S.T.P ‡Z 11.0 g M¨vm 5.60 dm3 AvqZb `Lj K‡i| M¨vmwUi †gvjvi f‡ii gvb KZ? [JU.2009-2010] A. 22 g B. 35 g C. 40 g D. 44g mwVK DËi: D. 44g e¨vL¨v: 22.4 V M m M = 44g 5.6 11 22.4 12. S.T.P †Z 250 mL M¨v‡mi IRb 1.0 g| M¨vmwUi AvYweK IRb KZ? [JU.2009-2010] A. 89.6 B. 22.4 C. 14.0 D. 28.0 mwVK DËi: A. 89.6 e¨vL¨v: 22.4 V M m ev, M = 22.4 1 0.25 = 89.6

CHEMISTRY PLUS cwigvYMZ imvqb 401 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES RU 01. hw` wb‡¤œv³ M¨vm¸‡jvi fi GKB nq Z‡e †KvbwU‡Z me©v‡cÿv Kg msL¨K AYy Av‡Q? [RU. 2019-20] A. Ar B. Cl2 C. CO D. SO2 mwVK DËi: B. Cl2 e¨vL¨v: W M = X NA GB m~Î †_‡K †evSv hvq M Gi gvb hZ e„w× cvq AYyi msL¨v ZZ n«vm cvq| 02. 5g CO2 M¨v‡m KZwU AYy _v‡K? [RU-G1.2017-18, CU. 2011-12] A. 6.841022 B.6.01022 C. 6.841018 D.5.841022 mwVK DËi: A. 6.841022 e¨vL¨v: X= M NAw = 44 5 6.02 1023 W = 6.841022 03. 27C ZvcgvÎvq 0.405 evqygÛj Pv‡c 200 wg.wj.M¨v‡m AYyi msL¨v KZ? [RU-H2.2017-18] A. 2.00761021 B.6.0231023 C. 6.0221021 D. 3.3311023 mwVK DËi: A. 2.00761021 e¨vL¨v: N=n NA= RT PVNA = 0.082 300 0.405 0.2 6.02 1023 =1.981021 04. 100 mL 0.25 M Na2CO3 ‣Zix‡Z Na2CO3 cÖ‡qvRb- [RU-C3.2017-18] A. 24.50 g B. 10.60 g C. 5.30 g D. 2.65 g mwVK DËi: D. 2.65 g e¨vL¨v: w = V(L)SM = 0.1 0.25 106 = 2.65g 05. 10 gm KClO3 m¤ú~Y© iƒ‡c we‡qvwRZ n‡j cÖgvY ZvcgvÎv I Pv‡c KZ ml Aw·‡Rb cvIqv hv‡e? [RU-H. 2015-16] A. 1371.5 B. 1000 C. 500 D. 2743 mwVK DËi: D. 2743 2KClO3 2KCl + 3O2 Easy Rule: 3 nKClO3 = 2 nO2 V ml V 2742.58 22400 2 122.5 10 3 06. 0.44 g CO2 G AYyi msL¨v- [RU:2013-2014, BSMRSTU. 2013-14] A. 6.0231023 B. 0.602310 23 C. 6.0231024 D. 6.0231021 mwVK DËi: D. 6.0231021 e¨vL¨v: NA x M m ev 23 6.023 10 x 44 0.44 ev x = 6.0231021 07. 250 mL 0.1 M NaOH `ªeY •Zwi Ki‡Z wK cwigvY NaOH cÖ‡qvRb? [RU. 2012-2013] A. 1 g B. 2 g C. 40 g D. 10 g mwVK DËi: A. 1 g e¨vL¨v: hyMvšÍKvix m~Î n‡Z, n = VS m M = VS m = MVS = 400.2500.1 = 1g 08. 750 mm Pv‡c I 27˚C ZvcgvÎvq 22 mL M¨v‡m KZwU Aby _v‡K? [RU. 12-13] A. 6.0231023 B. 5.3061018 C. 5.3061021 D. 5.6031020 mwVK DËi: C. 5.3061020 e¨vL¨v: X NA = PV RT X = 0.0821 300 0.986 0.022 6.023 1023 = 5.3061020 09. 20˚C DòZvq 740 mm Pv‡c 400 mL AvqZ‡bi †Kvb M¨v‡mi fi 0.842g| M¨vmwUi AvYweK fi KZ? [RU. 2012-2013] A. 52 B. 52.88 C. 53 D. 52.65 mwVK DËi: A. 52 e¨vL¨v: RT PV M m M = 52.2 0.97 0.400 0.842 .0821 293 10. 200mL 0.075M `ªeY •Zix‡Z wK cwigvb Na2CO3 cÖ‡qvRb? [RU.2012-13,CU.2010-11] A. 1.59g B. 10.60g C. 2.18g D. 0.53g mwVK DËi: A. 1.59g e¨vL¨v: m = MVS=106 0.2 0.075=1.59g 11. 250 mL†Wwm†gvjvi `ªe‡Y H2SO4 _vK‡e- [RU. 2012-2013, Xv.‡ev. 2016] A. 2.45 g B. 3.45 g C. 2.65 g D. 3.02 g mwVK DËi: A. 2.45 g e¨vL¨v: n = VS m M = VSm = MVS = 980.2500.1 = 2.45g CU 01. 1g cvwb‡Z KZwU AYy Av‡Q? [CU-A.2019-20] A. 3.346 1022 B. 6.0231023 C. 2.9891023 D. 18 mwVK DËi: A. 3.346 1022 02. 10 g f‡ii GK UzKiv ei‡d (Mr = 18) †gvU cigvYyi msL¨v KZ? [CU. 2019-20] A. 18 6 10 3 10 23 B. 18 6 10 10 23 C. 18 10 3 6 1023 D. 10 6 10 18 23 mwVK DËi: A. 18 6 10 3 10 23 e¨vL¨v: 18g ei‡d (H2O) cigvYy msL¨v 3 × 6.023 × 1023 wU 10g Ó Ó Ó Ó 3 × 6.023 × 1023 × 10 18 wU 03. 250mL 0.01M Na2CO3 (Mr = 106) `ªeY cÖ¯‘Z Ki‡Z wK cwigvY Na2CO3 cÖ‡qvRb? [CU. 2019-20] A. 1.3250 g B. 0.2650 g C. 2.650 g D. 0.1325 g mwVK DËi: B. 0.2650 g e¨vL¨v: W = SMV 1000 = 0.01 × 250 × 106 1000 = 0.265gm 04. GK †dvUv cvwb‡Z we`¨gvb †gvU cigvYyi msL¨v KZ? (GK †dvUv cvwbi AvqZb 0.05 cm3 , NbZ¡ 1 g/cm3 , AvYweK fi 18 Ges A¨v‡fvMv‡Wªv msL¨v 6 1023) [CU-A.2017-18] A. 18 30.05 B. 18 0.05 3 6 1021 C. 18 3 0.05 6 1023 D. 18 0.05 3 6 1023 mwVK DËi: D. 18 0.05 3 6 1023 e¨vL¨v: m = V = 10.05 = 0.05g X = 3mNA M = 30.0561023 18 (H2O AYy‡Z 2wU H I 1wU O cigvYy we`¨gvb)

402 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 05. 0.25 M HCl Gi 30 ml `ªe‡Y HCl Gi †gvj msL¨v KZ? [CU-F1.2016-17, P.‡ev. 2017] A. 0.0065 B. 0.0085 C. 0.0075 D. 0.0095 E. 0.0055 mwVK DËi: C. 0.0075 e¨vL¨v: n = VL S HCl Gi †gvjmsL¨v n=0.25 30 1000 =0.0075 06. 20 mL 0.002 M K2Cr2O7 `ªe‡Y KZ †gvj K2Cr2O7 Av‡Q? [CU-Ka.2016-17] A. 4.010-5 B. 4.010-2C. 4.010-4 D. 1.010-4 E. 1.010-1 mwVK DËi: A. 4.010-5 e¨vL¨v: n = VS = 20× 1000 0.002 = 4×10-5 07. 5.0g cvwb‡Z Aw·‡R‡bi cigvYyi msL¨v KZ? [CU-F. 2015-16] A. 1.881023 B. 6.0231023 C. 1.6731023 D. 3.3461023 E. 6.5321023 mwVK DËi: C. 1.6731023 e¨vL¨v: NA x M W 18 5 6.022 1023 M WN x A = 1.6731023wU 08. wb‡Pi †Kvb&wU‡Z me‡P‡q †ekx msL¨K N-cigvYy Av‡Q? [CU. 2014-15] A. 22.4 L N2 (STP †Z) B. 1.0 †gvj NH4Cl C. 6.021022 msL¨K NO2 AYy D. 500 mL 2.0M NH3 E. 1000 mL 1.0M NH4OH mwVK DËi: A. 22.4 L N2 (STP †Z) e¨vL¨v: STP †Z 22.4L N2 Gi g‡a¨ N cigvYyi msL¨v = 26.021023wU 1.0 †gvj NH4Cl Gi g‡a¨ N cigvYyi msL¨v = 6.021023 wU 500mL 2.0M NH3 = 1mol NH3 Gi g‡a¨ N cigvYyi msL¨v= 6.021023wU 1000mL 1M NH4OH = 1mol NH4OH Gi g‡a¨ N cigvYyi msL¨v = 6.021023wU 09. 4.4g CO2 Gi Kve©b cigvYyi msL¨v- [CU:13-14] A. 2.241022 B. 2.241023 C. 6.0231022 D. 6.0231023 E. †KvbwUB bq mwVK DËi: C. 6.0231022 e¨vL¨v: NA x M m ev 23 6.023 10 x 44 4.4 ev x = 6.0231022 10. 36 MÖvg cvwbi g‡a¨ H-cigvYyi msL¨v- [CU. 12-13] A. 1.21024 B.2.41024 C.1.51025 D. 3.61024 E. 1.81024 mwVK DËi: B.2.41024 e¨vL¨v: A A N M m x N x M m = 18 36 6.0231023 =1.21024 H2O ‡Z H cigvYyi msL¨v = 1.210242= 2.41024 11. 25C ZvcgvÎvq 100cm3 `ªe‡Y 5.85 MÖvg NaCl `ªexf‚Z Av‡Q| `ªeYwUi †gvjvwiwU KZ? [CU. 12-13] A. 58.5M B. 5.85M C. 1M D. 0.5M E. 10M mwVK DËi: C. 1M e¨vL¨v: m = MVS S = 1M 58.5 0.100 5.85 12. 5g CO2-†Z KZwU AYy Av‡Q? [CU.2011-12] A. 6.844 1022 B. 5.30 1024 C. 5.993 1022 D. 6.023 1023 mwVK DËi: A. 6.844 1022 e¨vL¨v: NA x M m X = 44 5 6.023 1023 = 6.8441022 13. 9 MÖvg cvwb‡Z AYyi msL¨v KZ? [CU. 2011-2012] A. 6.0231012 wU B. 5.0231021 wU C. 3.011023 wU D. 41023 wU E. 9.0231023 wU mwVK DËi: C. 3.011023 wU e¨vL¨v: NA x M m 18 9 6.023 1023 x = 3.011023 14. 250 mL cvwZZ cvwb‡Z 10.6 g weï× Na2CO3 `ªexf~Z Ki‡j Drcbœ `ªeYwUi NYgvÎv n‡e? [CU.2010-2011] A. 0.4 N B. 0.4 M C.2 N D. 2M mwVK DËi: B. 0.4 M e¨vL¨v: m = MVS S = 106 0.250 10.6 = 0.4M 15. ‡KvbwU‡Z me‡P‡q †ewk msL¨K AYy Av‡Q? [CU.2010-2011] A. 16 MÖvg NO2 M¨vm B. 7 MÖvg N2 M¨vm C. 16 MÖvg O2 M¨vm D. 2 MÖvg H2 M¨vm E. 35 MÖvg Cl2 M¨vm mwVK DËi: D. 2 MÖvg H2 M¨vm e¨vL¨v: XNO2 = 16 46 = 0.347 , XN2 = 7 28 = 0.25 XO2 = 16 32 = 0.5, XH2 = 2 2 = 1, XCl2 = 35 71 = 0.49 Short Technics: hvi ‡gvj msL¨v †ewk Zvi AYyi msL¨v †ewk| 16. GK MÖvg cvwb‡Z KZwU AYy Av‡Q? [CU.2009-10] A. 3.346 1022 B. 6.023 1023 C. 2.989 1023 D. 3.35 1024 E.18 mwVK DËi: A. 3.346 1022 e¨vL¨v: NA x M m 18 1 6.023 1023 x = 3.3461022 17. 25°C ZvcgvÎvq 100 cm3 `ªe‡Y 5.85 MÖvg NaCl `ªexf~Z Av‡Q| `ªeYwUi †gvjvwiwU KZ? [CU.2009-2010] A. 585M B. 5.85M C. 1M D. 0.5M E. 10M mwVK DËi: C.1M e¨vL¨v: m = MVS S = 58.5 0.100 5.85 = 1 18. 4.4 MÖvg CO2 M¨v‡mi cÖgvY Ae¯’vq AvqZb KZ? [CU.2009-2010] A. 2240 cm3 B. 4.4 dm3 C. 22.4 dm3 D. 2.24 cm3 E. 22.4 cm3 mwVK DËi: A. 2240 cm3 e¨vL¨v: 22.4 V M m 44 4.4 22.4 V = 2.24dm3 = 2240cm3 19. 1.2gm Kve©b evqy‡Z m¤ú~Y©iƒ‡c †cvov‡j †h CO2 Drcbœ n‡e Zvi AYyi msL¨v- [CU.2006-2007; 09-10] A. 1.2×1015 B. 6.022×1022 C. 6.022×1024 D. 1.2×1023 mwVK DËi: B. 6.022×1022 e¨vL¨v: NA x M m 23 6.023 10 X 12 1.2 X = 6.022 ×1022 20. 0.1N HCl Gi 250 mL `ªeY •Zix‡Z KZ MÖvg HCl jvM‡e? [CU.2009-2010] A. 36.5 B. 3.65 C. 1.83 D. 0.91 mwVK DËi: D. 0.91 e¨vL¨v: m = MVS = 36.50.10.25 = 0.912

CHEMISTRY PLUS cwigvYMZ imvqb 403 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 21. GKwU cvwbi AYyi fi KZ MÖvg? [CU.2009-2010, 13-14; CU-06-07] A. 1.85 10-23 B. 2.99 10-23 C. 3.82 10-23 D. 18.00 10-23 mwVK DËi: B. 2.99 10-23 e¨vL¨v: m M = X NA 18 23 6.023 10 1 m = 23 2.99 10 22. 5.5g CO2 M¨v‡m AYyi msL¨v KZ? [CU.2009-2010] A. 5.8431 1022 B. 7.5275 1022 C. 5.7275 1022 D. 5.5575 1022 mwVK DËi: B. 7.5275 1022 e¨vL¨v: NA x M m X = 44 5.5 6.023 1023 = 7.5275 1022 23. †Kvb GK eªv‡Ûi ¸‡ov `y‡ai 1 †KwR‡Z 60 wgwjMÖvg †gjvwgb Av‡Q| †gjvwg‡bi AvYweK ms‡KZ C3N6H6 n‡j H eªv‡Ûi 1 †KwR `y‡a KZ AYy †gjvwgb Av‡Q? [CU.2008-09] A. 2.881023 AYy B. 5.731023 AYy C. 1.431023 AYy D. 2.861020 AYy mwVK DËi: D. 2.861020 AYy e¨vL¨v: NA x M m = 23 -3 126 6.023 10 60 10 x x = 2.861020 24. 1 MÖvg nxi‡K KqwU cigvYy Av‡Q? [CU.2008-2009] A. 1.671023 B. 6.0231023 C. 5.021022 D. 1236987 E. 1.771023 DËit C. 5.021022 e¨vL¨v: NA x M m x = NA M m = 23 6.023 10 12 1 = 5.02 1022 [C 12g] 25. 0.44 MÖvg CO2 M¨v‡m KZ †gvj CO2 Av‡Q? [CU.2008-2009] A. 1.0 B. 0.01 C. 0.1 D. 0.5 mwVK DËi: B. 0.01 e¨vL¨v: 0.01 44 0.44 M m n 26. 9 MÖvg cvwb‡Z KZwU nvB‡Wªv‡Rb cigvYy Av‡Q? [CU.2006-07, 2008-2009] A. 181023 B. 41023 C. 121023 D. 61023 mwVK DËi: D. 61023 e¨vL¨v: NA x M m X = 6.023 10 2 18 9 23 = 6.023 1023 27. GK †gvj cvwb‡Z we`¨gvb AYyi msL¨v? [CU.2007-2008] A. 3 B. 6.02×1023 C.18.06×1023 D. 12.04×1023 E. 24.06×1023 mwVK DËi: B. 6.02×10 23 e¨vL¨v: 1 †gvj cvwb‡Z we`¨gvb Abyi msL¨v = A¨v‡fvM¨v‡Wªv msL¨v = 6.02×1023 28. Kve©‡bi GKwU AYyi cÖK…Z fi? [CU.2007-2008] A. 2.65×10-23 kg B. 0.16710-23 kg C. 1.992×10-28 kg D. 1.992×10-23 gm E. 6.023×10-23 gm mwVK DËi: D. 1.992×10-23 gm e¨vL¨v: M m = NA X m = NA XM = 23 6.023 10 1 12 = 1.992×10-23 gm 29. 16gm cwigvY O2 M¨v‡m AYy _v‡K- [CU.2006-2007] A. 3.011×1023 wU B. 6.023×1023 wU C. 3.011×1024 wU D. 2.011×1024 wU mwVK DËi: A. 3.011×1023 wU e¨vL¨v: NA x M m 23 6.023 10 32 16 X = 3.0111023 30. 1 gm O3 M¨v‡m KqwU AYy we`¨gvb? [CU.2006-2007] A. 1.88×1020 wU B. 1.03×1021 wU C. 1.25×1022 wU D. 6.023×1024 wU E. 2.50×1024 wU mwVK DËi: C.1.25×1022 wU e¨vL¨v: NA x M m 23 6.023 10 X 48 1 X = 1.251022 31. 273.15k Ges 760mm Hg Pv‡c 0.018g IR‡bi GK‡duvUv cvwb m¤ú~b©iæ‡c ev®úxf~Z n‡j †h AvqZb `Lj K‡i Zvi AvqZb- [CU. 2005-2006] A. 0.0224L B. 1L C. 0.0018L D. 1000L E. 18L mwVK DËi: A. 0.0224L e¨vL¨v: 18 1 0.018 0.082 273.15 V RT PV M m = 0.0224L KU 01. GKRb e¨w³ GKevi wbtk¦v‡m 200 mg evZvm MÖnY K‡i| hw` evZvm 20% (w/w) Aw·‡Rb aviY K‡i Zvn‡j wZwb GKevi wbtk¦v‡m KZ¸‡jv Aw·‡Rb AYy MÖnY K‡ib? [KU-C.2019-20] A. 7.52875 1020 B. 5.52875 1020 C. 4.52875 1020 D. 8.52875 1020 mwVK DËi: A. 7.52875 1020 e¨vL¨v: w M = X NA X NA = 0.2 200 1000 32 0.4 32 6.023 1023 = 7.52 1020 wU 02. Mvp H2SO4 Gi NbgvÎv 18M n‡j, 500ml 0.2M H2SO4 `ªeY •Zwi Ki‡Z KZ wgwj wjUvi GwmW jvM‡e? [KU-Rx:A: 2016-17] A. 1.40 B. 2.80 C. 5.56 D. 11.12 mwVK DËi: C. 5.56 S1V1 = S2V2 18 V1 = 500 0.2 V1 = 5.56 ml 03. 250 ml 0.1M NaOH ‣Zix Ki‡Z wK cwigvY NaOH cÖ‡qvRb? [KU. 2015-16] A. 5 gm NaOH B. 2 gm NaOH C. 2.5 gm NaOH D. 1 gm NaOH mwVK DËi: D. 1 gm NaOH e¨vL¨v: W = SMV 1000 = 0.140250 1000 = 1gm 04. GKRb †jvK GKevi cÖk¦v‡m 200 wgwjMÖvg evZvm MÖnY K‡i| hw` evZvm 20% (f‡i) Aw·‡Rb aviY K‡i Zvn‡j †jvKwU GKevi cÖk¦v‡m KZwU Aw·‡Rb AYy MÖnY K‡i? [KU. 2014-15] A. 7.528751020 B. 5.528751020 C. 4.528751020 D. 8.528751020 mwVK DËi: A. 7.528751020 e¨vL¨v: 20 23 A 7.52875 10 6.023 10 X 32 0.200 0.2 N x M m 05. 0.1 M HCl Gi cÖgvY `ªe‡Y KZ MÖvg HCl `ªexf‚Z Av‡Q? [KU.2011-2012] A. 36.50 g B. 6.50 g C. 30.60 g D. 3.65 g mwVK DËi: D. 3.65 g e¨vL¨v: m=MVS=36.5 0.1 1=3.65 g, V = 1 L a‡i wb‡Z n‡e|

404 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES IU 01. Aw·‡R‡bi GKwU cigvYyi cÖK…Z fi- [IU. 2019-20] A. 0.1673110–23g B. 1.992410–23g C. 2.656010–23g D. 1.656010–23g mwVK DËi: C. 2.656010–23g e¨vL¨v: Aw·‡R‡bi GKwU cigvYyi cÖK…Z fi W = 16 1 6.023 1023 = 2.656010–23g 02. cÖgvY ZvcgvÎv I Pv‡c 2 wjUvi wg‡_b M¨v‡m AYyi msL¨v- [IU-F,Set-B:2018-19, DU-Ka: 2017-18] A. 5.011018 B. 5.371022 C. 6.0231023 D. 3.011023 mwVK DËi: B. 5.371022 e¨vL¨v: 22 23 A 5.37 10 22.4 2 6.022 10 x 22.4 V N x 03. 150 wgwj 2 M CH3OH `ªeY ‣Zwi Ki‡Z CH3OH jvM‡e- [IU-D. 2016-17] A. 4.8 MÖvg B. 9.6 MÖvg C. 19.2 MÖvg D. 2.4 MÖvg mwVK DËi: B. 9.6 g e¨vL¨v: S = MV 1000 w , w = 1000 SMV = 1000 232 150 = 9.6 g 04. 420g †jvwnZ Zß Avqi‡bi Dci w`‡q ÷xg Pvjbv Ki‡j cÖgvY Ae¯’vq KZ AvqZb H2 cvIqv hv‡e? [IU. 2015-16] A. 224.6 wjUvi B. 22.4 wjUvi C. 32.5 wjUvi D. 1 wjUvi mwVK DËi: A. 224.6 wjUvi e¨vL¨v: 3Fe + 4H2O Fe3O4 + 4H2 H2 Gi cwigvY = 3 55.85 4 22.4 420 = 224.6 L 05. 500 ml 0.1M NaOH `ªeY •Zix‡Z NaOH cÖ‡qvRb - [IU:2013-2014, MBSTU. 2011-12] A. 1 MÖvg B. 2 MÖvg C. 3 MÖvg D. 4 MÖvg mwVK DËi: B. 2 MÖvg e¨vL¨v: w SMV 0.1 40 0.5 2gm MV w S 06. cÖgvY Zv‡c I Pv‡c 112 cm3 CO2 M¨v‡m AYyi msL¨v n‡e- [IU.2008-2009] A. 3.0111023 B. 3.0111021 C. 6.0221023 D. 6.0221021 mwVK DËi: B. 3.0111021 e¨vL¨v: N 22.4 x A v 22.4 V x = 22.4 0.112 6.023 1023 21 3.01110 wU BRU 01. 90g cvwb‡Z KqwU cvwbi AYy Av‡Q?[BRU-D1.2017-18, BSMRSTU. 2014-15] A. 3.011 1024 B. 5.018 1024 C. 6.018 1024 D. 2.11 1024 mwVK DËi: A. 3.011 1024 e¨vL¨v: 24 23 3.01 10 18 6.02 10 90 M N w X A 02. NTP-†Z 11.2 wjUvi I‡Rvb G Aw·‡Rb cigvYyi msL¨v KZ? [RpU:2013-14] A. 3.011023 B. 6.021023 C. 9.031024 D. 1.201024 mwVK DËi: A. 3.011023 e¨vL¨v: 22.4 V N x A ev, 23 23 3.01 10 22.4 11.2 6.023 10 x 03. 100 mL 0.1 M H2SO4 `ªe‡Y KZ MÖvg H2SO4? [Rp.U. 2012-2013] A. 49 B. 9.8 C. 0.98 D. 4.9 mwVK DËi: C. 0.98 e¨vL¨v: n = VS m M = VS m = MVS = 980.1000.1 = 0.98 BU 01. GK A¨v‡fv‡M‡Wªv msL¨K wnwjqvg AYyi fi- [BU. 2015-16] A. 1.00g B. 4.00g C. 8.00g D. 46.021023g mwVK DËi: B. 4.00g e¨vL¨v: †h †Kvb cigvYy ev AYyi cvigvYweK ev AvYweK fiB nj A¨v‡fv‡M‡Wªvi msL¨K fi| 02. 5 †gvj wg‡_b M¨vm evZv‡m c~Y© `nb Ki‡j †gvU KZ †gvj Drcv` n‡e? [BU. 2015-16, CU. 2011-12, JU. 2017-18] A. 15 B. 12 C. 9 D. 6 mwVK DËi: A. 15 e¨vL¨v: CH4 + 2O2 CO2 +2 H2O mol 1 mol wg‡_b †_‡K cvB = (1+2) mol Drcv` 5 mol " " " = (35) = 15 mol " DU-7Clg 01. 36 g cvwb‡Z AYyi msL¨v KZ? [7Clg. 2019-20] A. 12.046 1023 B. 1.673 1023 C. 1.325 1023 D. 1.545 1023 mwVK DËi: A. 12.046 1023 e¨vL¨v: W M = X NA X = 36 18 6.023 1023 X = 12.046 1023 02. S.T.P. †Z †Kvb M¨vmwUi 4.4 g Gi AvqZb 2.24 L n‡e? [7Clg. 2019-20] A. CO B. N2 C. CO2 D. NH3 mwVK DËi: C. CO2 e¨vL¨v: W M = V 22.4 M = 4.4 22.4 2.24 = 44 gm M¨vmwUi bvg, CO2 03. GK †gvj H2 M¨v‡m KqwU B‡j±ªb Av‡Q? [7clg,Unit-A:2018-19] A. 6.021023 B. 6021046 C. 2.021022 D. 12.041023 mwVK DËi: D. 12.041023 e¨vL¨v: 1 mol H2 G 2 mol H cigvYy Av‡Q| ZvB X=nNA = 2×6.02×1023 STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION SUST 01. 6 MÖvg Kve©b‡K evZv‡m m¤ú~Y©iƒ‡c `nb Ki‡Z KZ¸‡jv Aw·‡Rb AYy cÖ‡qvRb n‡e? [SUST-B. 2019-20] A. 1.88 × 1022 B. 3.01 × 1023 C. 5.02 × 1022 D. 1.0 × 1023 E. 1.37 × 1022 mwVK DËi: B. 3.01 × 1023 e¨vL¨v: C+ O2 CO2 12 gm 6.023 1023wU W M = x NA x = W NA M = 6 6.023 1023 12 = 3.01 1023wU O2 AYy| 02. 1 †KwR weï× cvwb‡Z KZ¸‡jv AYy _vK‡e? [SUST-A. 2019-20] A. 6.023 × 1026 B. 3.346 × 1025 C. 55.55 × 1023 D. 6.023 × 1023 E. 3.35 × 1022 mwVK DËi: B. 3.346 × 1025 e¨vL¨v: W M = X NA 1000 18 = X 6.023 1023 X = 3.346 1025 355.85 422.4L

CHEMISTRY PLUS cwigvYMZ imvqb 405 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 03. GKUz Pzbvcv_i L‡Ûi fi 250g| G‡K D”P ZvcgvÎvq K‡qK N›Uv DËß Ki‡j STP- †Z 44.8 wjUvi CO2 cvIqv †Mj| Pzbvcv_‡ii bgybv‡Z CaCO3 Gi cwigvY kZKiv KZfvM? [SUST-B.2016-17] A. 72 B. 80 C. 88 D. 96 E. 98 mwVK DËi: B. 80 e¨vL¨v: CaCO3 CaO + CO2 100 g 22.4 L Here, 1002 = 200g ev, % CaCO3 = 250 200 100 = 80 04. 2.0 mol dm-3 Na2SO4 Gi 200 cm3 `ªe‡Y KZ †gvj SO4 2– Av‡Q? [SUST.2011-2012] A. 0.02 B. 0.4 C. 0.2 D. 0.04 mwVK DËi: B. 0.4 e¨vL¨v: n = VS = 2 0.200 mol Na2SO4 = 0.4 mol SO4 2– 05. Av`k© Pvc I Zv‡c 2g nvB‡Wªv‡Rb M¨v‡m 6.0221023 wU AYy _vK‡j 64g Aw·‡Rb M¨v‡m KZwU AYy _vK‡e? [SUST.2010-2011] A. 6.0221023 B. 646.0221023 C. 326.0221023 D. 26.0221023 mwVK DËi: D. 26.0221023 e¨vL¨v: 2g H2 ev 1mol M¨v‡m AYyi msL¨v = 6.0231023 23 6.022 10 32 64 X N x M m A = 26.0221023 06. 4 °C ZvcgvÎvq 90mL weï× cvwb‡Z KZ AYy cvwb Av‡Q? [SUST.2010-2011] A. 6.022×1023 B. 3.011×1024 C. 0.602×1023 D. 3.023×1023 mwVK DËi: B. 3.011×1024 e¨vL¨v: Avgiv Rvwb-1000ml cvwbi fi = 1000g 90ml cvwbi fi = 90g 23 6.023 10 18 90 X N x M m A = 3.0111024 07. GK wjUvi weï× cvwb‡Z KZ †gvj cvwb Av‡Q? [SUST.2008-2009] A.10 mol B. 55.55 mol C. 30 mol D. 1000 mol mwVK DËi: B. 55.55 mol e¨vL¨v: N = m M = 1000 18 = 55.55 mol 08. 1.0 kg CaCO3 †K jNy HCl G `ªexf~Z Ki‡j STP †Z KZ AvqZ‡bi CO2 M¨vm cvIqv hv‡e? [SUST.2008-2009] A. 224L B. 230L C. 250L D. 22.4L mwVK DËi: A. 224L e¨vL¨v: 22.4 V M m V = 22.4 100 1000 V = 224 L 09. 18 MÖvg cvwb‡Z AYyi msL¨v- [SUST.2008-09, w`.‡ev. 2015] A. 3.0231023 B. 6.0231023 C. 6.0231025 D. 2.0231023 mwVK DËi: B. 6.0231023 e¨vL¨v: 18 MÖvg cvwb ej‡Z 1 †gvj cvwb‡K eySvq| hv‡Z 6.0231023 msL¨K Aby Av‡Q| 10. GK MÖvg cvwb‡Z KqwU AYy Av‡Q? [SUST.2006-2007, 08-09] A. 6.203×1023 B. 3.346×1023 C. 3.346×1022 D. 2.9885×1023 mwVK DËi: C. 3.346×1022 e¨vL¨v: m M = X NA 22 23 3.346 10 18 1 6.023 10 11. CO2 Gi GKwU AYyi fi n‡”Qt [SUST.2006-07; 08-09] A. 6.022×1023 gm B. 6.023×1023 kg C. 7.3065×10-26 kg D. 7.306×1023 kg mwVK DËi: C. 7.3065×10-26 kg e¨vL¨v: M m NA x m = g 23 23 7.306 10 6.023 10 1 44 kg 26 7.306 10 12. 2gm wg‡_‡b AYy‡Z †gvU KZwU B‡jKUªb Av‡Q? [SUST.2007-2008] A. 6.023×1023 B. 15.04×1023 C. 7.25×1023 D. 20 mwVK DËi: B. 15.04×1023 e¨vL¨v: 23 A 6.023 10 16 2 N X M m = 23 22 15 10 5 7.52 10 mZ©Kt †gvU kãwU D‡jøL _vKvq cigvYyi msL¨v‡K 5 Øviv fvM Kiv n‡q‡Q| 13. cÖgvY Ae¯’vq 2.2gm CO2 M¨v‡mi AvqZb n‡eÑ [SUST.2006-2007] A. 0.12 L B. 1.12 L C. 2.12 L D. 3.12 L mwVK DËi: B. 1.12 L e¨vL¨v: 22.4 V M m 22.4 V 44 2.2 = 1.12 L 14. 1mole cvwb = KZ MÖvg cvwb? [SUST.2006-2007] A. 23gm B. 18gm C. 36gm D. 9gm mwVK DËi: B. 18gm e¨vL¨v: m = n M = 1 18 = 18g JUST 01. cÖgvY ZvcgvÎv I Pv‡c (STP) 11.2 wjUvi CO2 M¨v‡m KqwU O2 cigvYy _v‡K? [JUST-A: 2019-20] A. 22 1023 B. 6.023 1022C. 12.0461023 D. 6.023 1023 mwVK DËi: D. 6.023 1023 e¨vL¨v: V 22.4 = X NA X NA = 11.2 22.4 X = 0.5 NA O2 cigvYyi msL¨v = 0.5 NA 2 = 1NA = 6.023 1023 wU 02. 100 mL 0.5 M Na2CO3 `ªeY †_‡K KZ mL 0.1 M `ªeY •Zwi Kiv hv‡e? [JUST-A. 2019-20] A. 100 mL B. 1000 mL C. 500 mL D. 50 mL mwVK DËi: C. 500 mL e¨vL¨v: V2S1 = V2S2 100 0.5 V2 = 100 0.5 0.1 = 500 mL 03. 30˚C DòZvq I 740 mm cvi` Pv‡c 25 mL M¨v‡mi AYyi msL¨v KZ? [JUST-A: 2019-20] A. 8.597 1020 B. 5.897 1020C. 9.857 1020 D. 7.958 1020 mwVK DËi: B. 5.897 1020 e¨vL¨v: X NA = PV RT X = PVNA RT = 0.973 0.025 6.023 1023 0.0821 303 = 5.88 1020 wU Here, P = 740 760 atm = 0.973 atm and, V = 25 1000 L= 0.025L 04. NTP-‡Z 2.0 L CH4 M¨v‡m AYyi msL¨v KZ? [JUST-A,Set-Kha 2018-19] A. 5.3781022 B. 5.0201022 C. 2.6891019 D. 9.2901016 mwVK DËi: A. 5.3781022 e¨vL¨v: 22 A x 5.378 10 22.4 V N x wU 05. 5.0 g Aw·‡R‡b KZwU AYy Av‡Q? [JUST-A: 2018-19] A. 6.0231023 B. 32 C. 0.9411023 D. 16 mwVK DËi: C. 0.9411023 e¨vL¨v: 23 23 A 0.941 10 32 5 6.023 10 x N x M W

406 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 06. 44g CO2 M¨v‡m Abyi msL¨v KZ n‡e? [JUST-A,Set-Kha 2018-19] A. 6.0221023 B. 60.221023 C. 6.0221024 D.12.0441023 mwVK DËi: A. 6.0221023 e¨vL¨v: M w N x A 23 23 6.022 10 44 44 6.022 10 x wU 07. 1.5g Kve©b evZv‡m `nb Kivi d‡j †h CO2 Drcbœ nq Zvi AvqZb cÖgvY Zvc I Pv‡c KZ wjUvi? [JUST-B.2017-18] A. 2.8 lit B. 0.357 lit C. 14.9 lit D. 1.9 lit mwVK DËi: A. 2.8 lit e¨vL¨v: Lit W V M V W C 2.8 12 1.5 22.4 12 22.4 22.4 08. 0.540M nvB‡Wªv‡K¬vwiK Gwm‡Wi 155 mL `ªe‡Y wK cwigvY nvB‡Wªv‡K¬vwiK GwmW `ªexf~Z _vK‡e? [JUST-B. 2016-17] A. 3.06g B. 3.48 g C. 4.27 g D. 5.27 g mwVK DËi: A. 3.06g e¨vL¨v: S= MV 1000 W ; W = 1000 0.54 155 36.5 = 3.06 g 09. GKwU cvwbc~Y© cvÎ cÖwZw`b 10g IRb nvivq| cÖwZ †m‡K‡Û cvwbi KZwU AYy ev‡®ú cwiYZ nq? [JUST-B. 2016-17] A. 3.87×1018 B. 3.87×1016 C. 3.87×1021 D. 3.87×1014 mwVK DËi: A. 3.87×1018 e¨vL¨v: ev®úxf~Z AYyi msL¨v = N N = n×NA = 18 10 ×6.023×1023 × 24 60 60 1 = 3.87 × 1018 wU AYy| 10. 250 ml ‡Wwm‡gvjvi `ªe‡Y KZ MÖvg H2SO4 Av‡Q? [JUST. 2015-16] A. 2.45 g B. 2.54 g C. 4.9 g D. 9.8 g mwVK DËi: A. 2.45 g e¨vL¨v: 1000 0.1 98 250 1000 SMV W = 2.45g 11 . 5 L 0.1M `ªeY •Zwi Ki‡Z Kx cwigvY Na2CO3 cÖ‡qvRb? A. 106g B. 53g C. 10.6 g D. 5.3g mwVK DËi: B. 53g e¨vL¨v: cÖ‡qvRbxq Na2CO3, m = SMV= 0.11065=53g MBSTU 01. STP †Z †Kv‡bv M¨v‡mi GK wjUv‡i KZ †gvj M¨vm _v‡K? [MBSTU-B1.2017-18; 2016-17] A. 0.224 B. 4.50 C. 0.45 D. 0.045 mwVK DËi: D. 0.045 e¨vL¨v: mol v n 0.0446 22.4 1 22.4 02. 10%CaCl2 Gi 200 mL `ªe‡Y KZ MÖvg CaCl2 _v‡K? [MBSTU-A1.2017-18] A. 10g B. 20g C. 11.1g D. 5g mwVK DËi: B. 20g e¨vL¨v: S = 112 100 112 10 10 W = V(L) S(M)M = 0.2 112 20g 112 100 BSMRSTU 01. Kve©‡bi GKwU cigvYyi cÖK…Z fi KZ? [BSMRSTU-C.2017-18] A. 2.656 10-23 kg B. 0.167 10-23 kg C. 1.992 10-26 kg D. 6.023 10-23 kg mwVK DËi: C. 1.992 10-26 kg 02. 72 MÖvg cvwbi Abyi msL¨v KZ? [BSMRSTU-C.2017-18] A. 6.022 1023 B. 12.022 1023 C. 18.022 1023 D. 24.022 1023 mwVK DËi: D. 24.022 1023 03. 71 MÖvg †K¬vwi‡bi g‡a¨ KZ †gvj Cl2 i‡q‡Q? [BSMRSTU-H.2017-18] A. 0.1 mol B. 1.0 mol C. 0.2 mol D. 0.4 mol mwVK DËi: B. 1.0 mol e¨vL¨v: n = W M = 71 71 = 1 04. STP †Z 11.0 g M¨vm 5.60 dm3 AvqZb `Lj K‡i| M¨vmwUi †gvjvi f‡ii gvb KZ? [BSMRSTU-H.2016-17] A. 22 gm B. 35 gm C. 40 gm D. 44 gm mwVK DËi: D. 44 gm e¨vL¨v: 22.4 V M W M = 5.6 11 22.4 V W 22.4 w = 44 05. 200gm Zn jNy H2SO4 Gi mv‡_ wewµqv K‡i KZ MÖvg H2 Drcbœ Ki‡e? (Zn Gi cvigvbweK fi 65) [BSMRSTU. B. 2016-17] A. 200 gm B. 400 gm C.6.165 gm D. 12.33 gm mwVK DËi: C.6.165 gm , KvQvKvwQ DËi weavq mwVK| e¨vL¨v: Zn + H2SO4 ZnSO4 + H2 65g Zn 2g H2 200g Zn 65 2 200 = 6.154 g H2 PUST 01. 4°C ZvcgvÎvq weï× cvwbi †gvjvi NbgvÎv- [PBSTU-B.2016-17] A. 18 B. 1 C. 55.5 D. 100 mwVK DËi: C. 55.5 e¨vL¨v: S = 1000W MV = 1000 1000 18 1000 = 55.5 [1L ev 1000ml weï× cvwb = 1000gm] 02. cÖgvY Ae¯’vq 15L CO2 M¨vm cÖ¯ÍyZ Ki‡Z wK cwigvY CaCO3 DËß n‡e? [PBSTU-A1/A2.2016-17] A. 77.65g B. 55.44g C. 33.21g D. 66.96g mwVK DËi: D. 66.96g e¨vL¨v: CaCO3 CaO + CO2 W M = V 22.4 ev W 100 = 15 22.4 W = 66.96g HSTU 01. 5gCO2 M¨v‡mi NTP †Z AvqZb KZ? [HSTU-A.2017-18] A. 3.169L B. 2.545L C. 2.554L D. 22.400L mwVK DËi: B. 2.545L e¨vL¨v: L M W V 2.545 44 22.4 5 22.4 PSTU 01. 250ml ‡Wwm‡gvjvi H2SO4 `ªe‡Y H2SO4 Gi cwigvY- [PSTU-A.2017-18] A. 2.45 gm B. 24.5 gm C. 245 gm D. 0.245 gm mwVK DËi: A. 2.45 gm e¨vL¨v: W V(L)S(M )M 0.25 0.198 2.45g

CHEMISTRY PLUS cwigvYMZ imvqb 407 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 02. 22 gm CO2 M¨v‡m KZwU AYy Av‡Q? [PSUT-A.2017-18, Xv.‡ev. 2014] A. 6.02 1023 B. 3.01 1023 C. 6.02 1022 D. 3.01 1022 mwVK DËi: B. 3.01 1023 e¨vL¨v: X NA = m M X = m NA M = 22 6.02 1023 44 = 3.01 1023 STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION BUET 01. GKwU †cwÝj w`‡q “Bangladesh University of Engineering and Technology (BUET)” wjL‡Z 0.55mg MÖvdvBU cÖ‡qvRb|[BUET. 2018-19] (a) H †jLvi g‡a¨ Kve©b cigvYyi msL¨v †ei Ki| (b) Aw·‡R‡b `nb Ki‡j STP †Z D³ Kve©b cigvYymg~n Øviv Drcbœ M¨v‡mi AvqZb wjUv‡i †ei Ki e¨vL¨v: (a) 12 0.55 10 6.02 10 M WN X M W N X 3 23 A A = 2.761019 wU (b) C+O2CO2 12 0.55 10 22.4 12 W 22.4 V M W 22.4 V 3 = 1.02610-3L KUET 01. cvwbc~Y© GKwU cvÎ cÖwZ N›Uvq 150mg IRb nvivq| cÖwZ †m‡K‡Û cvÎwU †_‡K KZwU Rjxq ev‡®úi AYy m„wó nq? [KUET. 2018-19] A. 1.3951015wU B. 1.3951016wU C. 1.3951014wU D. 1.3951018wU E. 1.3951019wU mwVK DËi: D. 1.3951018wU e¨vL¨v: 1s G IRb nvivq = 150 103 3600 = 4.17 105 g X NA = w M X = wNA M = 4.17 105 6.02 1023 18 = 1.395 1018 wU 02. GKwU Kve©‡bU †h․‡Mi 1.0g GKwU 100.0cm3 AvqZbwgwZK d¬v‡· wb‡q cvwb †hvM K‡i up to the mark Kiv n‡jv| AvqZbwgwZK we‡kølY K‡i †`Lv †Mj `ªeYwUi NbgvÎv 0.1M| †h․MwUi ms‡KZ wbY©q Ki| [`ªeYwU ÿvixq] [KUET. 2018-19] A. (CH3)2CO3 B. Na2CO3 C. SrCO3 D. MgCO3 E. CaCO3 mwVK DËi: E. CaCO3 e¨vL¨v: S = 1000 w V M = 1000 1 100 0.1 = 100 g (CH3)2CO3 Gi AvYweK fi = (15 2) + 12 + 48 = 90 Na2CO3 Gi AvYweK fi = 46(23 2) + 12 + 48 = 106 SrCO3 Gi AvYweK fi = 87 + 12 + 48 = 147 MgCO3 Gi AvYweK fi = 24 + 12 + 48 = 84 CaCO3 Gi AvYweK fi = 40 + 12 + 48 = 100 03. 100mL `ªe‡Y BDwiqvi 6.023×1020 wU AYy Av‡Q| `ªeYwU‡Z BDwiqvi NbgvÎv n‡jv- [KUET-2016-17] A.0.0001 B. 0.001 C.0.010 D. 0.100 E.1.000 mwVK DËi: C.0.010 e¨vL¨v: S= MV 1000W = 100 1000 M M N N A = 10 × 6.023 1020 6.023 1023 = 0.01 04. STP ‡Z 22.4L H2 M¨vm 11.2L Cl2 M¨v‡mi mv‡_ wgwkªZ K‡i HCl M¨vm •Zix Kiv nj| Drcbœ HCl M¨vm Gi cwigvY (†gvj) KZ n‡e? [KUET-2016-17] A. 0.5 B. 0.75 C. 1.0 D. 1.5 E. 2.0 mwVK DËi: C. 1.0 e¨vL¨v: H2(g) + Cl2(g)2HCl(g) limiting reagent = Cl2; nCl2 = 22.4 11.2 = 0.5 mol nHCl = 2 0.5 mol = 1mol 05. 250mL H2SO4 950mL cvwb‡Z `ªexf~Z Kiv n‡j D³ `ªe‡Yi kw³gvÎv †gvjvwiwU‡Z wbY©q Ki| [H2SO4 Gi NbZ¡ =1.98 g/mL][KUET-2016-17] A. 2.66 M B. 3.50M C. 4.55 M D. 5.32 M E. 6.45 M mwVK DËi: D. 5.32 M e¨vL¨v: S = MV 1000W = 1000 250 1.98 98 950 = 5.32M GLv‡b, W = 250×1.98 g = 495 g 06. 100 ml ÿvixq cvwb m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 16.9ml N/50 HCl cÖ‡qvRb| cvwbi ÿvi‡Z¡i cwigvY KZ? [KUET. 2015-16] A. 169 ppm B. 338 ppm C. 338 ppb D. 16.9 ppm E. 84.5 ppm mwVK DËi: B. 338 ppm e¨vL¨v: Sÿvi = 16.9 1000 1 50 1000 100 = 3.3810-3 mol L-1 = 338ppm N 50 = M 50 , e = 1 07. 27°C ZvcgvÎv‡Z 31.50gm HNO3 GwmW 1200ml cvwb‡Z `ªexf~Z Kiv nj| `ªeYwUi kw³ gvÎv †gvjvwjwU‡Z KZ n‡e? [cvwbi NbZ¡ = 0.9877gm/ml] [KUET. 2014-15, RUET. 2016-17] A. 0.41 molal B. 0.42 molal C. 0.60 molal D. 1.66 molal E. 0.21 molal mwVK DËi: B. 0.42 molal e¨vL¨v: 1000W`ªe = mWM`ªveK 100031.50=m(12000.9877)63m = 0.42molal 08. NaOH Gi Rjxq `ªe‡Yi NbZ¡ 1.10gcm –3 | `ªeYwUi NbgvÎv 0.1M n‡j `ªeYwU‡Z kZKiv KZ fvM (f‡i) cvwb Av‡Q? [KUET. 2014-15] A. 99.60 B. 89.40 C. 99.64 D. 89.44 E. 96.36 mwVK DËi: C. 99.64 e¨vL¨v: 100cm3 `ªe‡Yi fi 110gm Avevi, 1000W = CMV 1000 × W = 0.1 × 40 × 100 W = 0.4gm A_©vr Zv‡Z 0.4gm `ªe Av‡Q| cvwbi kZKiv cwigvY = 110 – 0.4 120 100% = 99.64% 09. 10mg 14 C ‡g․‡j wbDUª‡bi fi KZ? [KUET. 2014-15] A. 4.32 × 10-6 kg B. 5.04 × 10-6 kg C. 5.76 × 10-6 kg D. 5.76 × 10-6 kg E. 5.76 × 10-6mg mwVK DËi: D. 5.76 × 10-6 kg e¨vL¨v: n = w M = 10 10–3 14 = 7.1428 10–4 mol; wbDUªb 14 – 6 = 8 wbDUª‡bi fi = 8 × 7.1428 × 10-4 × 1.675 × 10-28 × NA = 5.76 × 10-6 kg 10. GKwU Pzbvcv_‡ii bgybvq 92% CaCO3 Av‡Q| jNy HCl G 100gm Pzbvcv_i `ªexf~Z K‡i STP ‡Z KZ wjUvi CO2 cvIqv hv‡e? [KUET. 2014-15] A. 22.40L B. 21.50L C. 20.60L D. 32.25L E. 24.37L mwVK DËi: C. 20.60L e¨vL¨v: CaCO3 + HCl CaCl2 + H2O + CO2 100gm 22.4L 92 100 100 100 = v 22.4 v = 20.60L

408 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 11. 650mm Pvc I 30ºC ZvcgvÎvq 950ml M¨v‡m KZwU M¨v‡mi AYy Av‡Q? [KUET. 2014-15] A. 0.1972 × 1023 B. 1.9672 × 1023 C. 1.9426 × 1021 D. 1.9426 × 1022 E. 2.0112 × 1023 mwVK DËi: A. 0.1972 × 1023 e¨vL¨v: PV = N NA RT 650 760 950 1000 = N NA 0.0821 303 N = 0.19672 1023 12. evZv‡m STP-†Z CO Gi NbgvÎv 250 ppb n‡j 5 dm3 evZv‡m CO AYyi msL¨v †KvbwU? [KUET. 2012-13] A. 3.05 1019 B. 3.057 1016 C. 1.263 1015 D. 1.263 1018 E. 3.019 1014 mwVK DËi: A. 3.05 1019 e¨vL¨v: 103 ppb = 1 ppm 250 ppb = 250 103 ppm; [ppb = Parts Per billion, ppm = Parts Per million] Avevi, 1 ppm = 1 mg/L 250 103 ppm = 250 103 mg/L 1L ev, 1 dm3 evZv‡m CO _vK‡e = 250 103 mg 5 dm3 evZv‡m CO _vK‡e = 250 1035mg = 1.25mg = 1.25103 gm w M = X NA X = w NA M = 250 103 5 6.023 10 23 28 = 3.05 1019 RUET 01. 200mL 0.075M `ªeY •Zix‡Z wK cwigvY Na 2CO3 cÖ‡qvRb? [RUET. 2013-14] A. 1.59g B. 10.60g C. 2.18g D. 0.53g E. None mwVK DËi: A. 1.59g e¨vL¨v: M 23 2 12 16 3 106 Na2CO3 m = MVS = 1060.2000.075 = 1.59g CUET 01. Lyjbv GjvKvi K…wl Rwgi cvwb‡Z 585 ppm NaCl Av‡Q| H cvwb‡Z NaCl Gi †gvjvwiwU KZ? [CUET. 2015-16] A. 0.05 M B. 0.04 M C. 0.01 M D. 0.03 M mwVK DËi: C. 0.01 M e¨vL¨v: †gvjvwiwU = ppm 1000M = 585 100058.5 = 0.01M BUTex 01. 200mL 0.1M Na2CO3 `ªe‡Y KZ MÖvg Na2CO3 Av‡Q? [BUTex-2016-17, DU. 2009-10] A. 2.12 mole B. 21.2 g C. 0.212 g D. 2.12 g mwVK DËi: C. 2.12 g e¨vL¨v: Na2CO3 Gi cwigvY, m =MVS= 0.20.1106g = 2.12g 02. 0.5 mol CO2 M¨v‡m Aw·‡Rb cigvYyi msL¨v KZ? [BUTex-2016-17] A. 1.51×1023 B. 3.01×1023 C. 6.02×1023 D. 12.04×1023 mwVK DËi: C. 6.02×1023 e¨vL¨v: 1 mole CO2 ‡Z O cigvYy =2 n= 0.56.023 10 2 23 X N X A 6.02×1023 03. weï× cvwbi †gvjvwiwU KZ? [BUTex.13-14, PUST. 16-17] A. 1.16M B. 5.56M C.18.36M D. 55.56M mwVK DËi: D. 55.56M e¨vL¨v: 1000ml cvwb = 1000gm cvwb = 1L cvwb 55.56M 18 1 1000 MV L W S 04. 11g CO2 G KqwU Aby Av‡Q? [BUTex.13-14] A. 23 6.02310 B. 23 5.5210 C. 23 1.510 D. 23 1.6710 mwVK DËi: C. 23 1.510 e¨vL¨v: NA x M m ev 23 6.023 10 x 44 11 ev x = 23 1.510 Board Q. 01. evqy‡Z AvqZb wn‡m‡e 21% Aw·‡Rb we`¨gvb| 5% A`vn¨ c`v_© Av‡Q Ggb 1 kg Kqjvi `nb NUv‡Z cÖgvY Ae¯’vq KZ AvqZb evqy cÖ‡qvRb? e¨vL¨v: C + O2 CO2 1 kg Kqjvi C Av‡Q 1000 0.95 = 950 gm = 79.17 mole 1 mole C R¡vjv‡Z cÖ‡qvRb 22.4L O2 79.17 mole C R¡vjv‡Z cÖ‡qvRb 22.4 79.17L O2 = 1773.33L O2 evqy cÖ‡qvRb 1773.33 L 0.21 = 8444.44 L CONCEPT 10 †gvj msL¨v I Zzj¨ msL¨vi MvwYwZK cÖ‡qvM hyMvšÍKvix gnvb m~Î n e(Neutralizer) = n e(Neutralized) evsjvq- (†gvj msL¨v Zzj¨ msL¨v)cÖkgbKvix = (†gvj msL¨v Zzj¨ msL¨v)cÖkwgZ ‡gvjvwiwU I †gvjvi NbgvÎvi †¶‡Î, vse = vse m~ÎwUt n1 e1 = n2 e2 Gi wZbwU iƒ‡c cÖkœ Av‡m, (i)V1S1e1 = V2S2e2 (ii) ne = ne ev, e M m e M m hZ Av‡Q RviY-weRviY ivmvqwbK MYbvi mgm¨v, mnR m~‡Î AsK K‡l ‡`L Gevi cvwÛ‡Z¨i fimv

CHEMISTRY PLUS cwigvYMZ imvqb 409 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES †Zvgv‡`i‡K †gvj msL¨v I Zzj¨ msL¨v‡K cwiPq Kwi‡q w`‡qwQ bv? Gevi GKUz we‡kølYx `„wó wb‡q jÿ¨ KitItem–01 Df‡qi NbgvÎv D‡jøL _vK‡j (n = VS) t GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) GwmW ÿvi UvB‡Uªk‡bi g~jZË¡ n‡jv VA SA X = VB SB Y VA = Gwm‡Wi AvqZb SA = Gwm‡Wi NbgvÎv VB = ÿv‡ii AvqZb SB = ÿv‡ii NbgvÎv X = ÿvi‡Ki A¤øZv Y = A‡¤øi ÿviKZv †UKwbK: V1S1e1 = V2S2e2 V1 = Gwm‡Wi AvqZb S1 = Gwm‡Wi NbgvÎv V2 = ÿv‡ii AvqZb S2 = ÿv‡ii NbgvÎv e1 = Gwm‡Wi Zzj¨msL¨v e2 = ÿvi‡Ki Zzj¨msL¨v MODEL EXAMPLE-01: 100ml 0.001M Na2CO3 `ªeY‡K cÖkwgZ Kivi Rb¨ 0.2M HCl `ªe‡Yi ‡h AvqZb cÖ‡qvRb n‡eGENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) Na2CO3 + 2HCl NaCl + CO2 + H2O VA SA X = VB SB Y VA = 100 ml 100 0.001 2 = VB 0.2 1 SA = .00l M Y = A‡¤øi ÿviKZv = 2 VB = 100 0.2 2 0.2 1 = l ml VB = ? SB = .2 M X = ÿvi‡Ki A¤øZv = 1 V1S1e1 = V2S2e2 V1 0.2 1= 100 0.001 2 V1= 1 ml MODEL EXAMPLE-02: 50mL †mwg‡gvjvi H2SO4 Ges 100 ml †Wwm‡gvjvi NaOH `ªeb wgkv‡j H wgkÖbwU A¤øxq n‡e bv ÿvixq n‡e? wgkÖYwUi NbgvÎv wbY©q Ki| GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) H2SO4 Gi †gvj msL¨v nA = VASA = .05L 0.5 molL–1 = .025 mol NaOH Gi †gvj msL¨v nB = VBSB = .1L .l molL–1 = .01 mol wewµqv : H2SO4 + 2NaOH Na2SO4 + H2O l mol 2mol mgxKiY n‡Z cvB 2mol NaOH wewµqv K‡i l mol H2SO4 Gi mv‡_ 0.01 mole = 5 10–3 mol H2SO4Gi mv‡_ d‡j, wgwkÖZ `ªe‡Y H2SO4 Aewkó Gi mv‡_ _v‡K = (0.025 – 5 10–3 ) mol = .02 wgkÖYwU A¤øxq wgwkÖZ `ªe‡Y H2SO4 Gi †gvjvwiwU, S = n v = 0.02 0.15 molL–1 = 0.13 molL–1 GLv‡b, H2SO4 `ªeY Gi SA = 0.5 molL–1 AvqZb VA = 50ml = .05L NaOH `ªeY Gi NbgvÎv SB = .1 molL–1 AvqZb, VB = 100 ml = 0.1L VN = V1S1e1 V2S2e2 VN = (50 0.5 1) (100 0.1 1) (100 + 50)N = 50 10 N = 40 50 = 0.26 N S = N e = 0.13 M Ex.2: 1.5M NaOH `ªe‡Yi 50mL cÖkgb Ki‡Z 2.5M H2SO4 Gwm‡Wi †h cwigvY jvM‡emgvavbt H2SO4 NaOH; V1S1e1 V2S2e2 V1 2.5 2 = 50 1.5 1 V1 = 15 Ex.3: 100 ml 0.5M Na2CO3 `ªeY †_‡K KZ ml †Wwm‡gvjvi `ªeY •Zix Kiv hv‡e? mgvavbt me †ÿ‡Î, VSe = VSe G‡ÿ‡Î Zzj¨ msL¨v e jvM‡ebv KviY e¯‧ GKwU| V1S1 = V2S2 => 1000.5 = V20.1 => V2 = 500mL Ex.4: 20 H2SO4 1L M / ‡K cÖkwgZ Ki‡Z 5% Na 2CO3 Gi KZ AvqZb jvM‡e? mgvavbt H2SO4 Na2CO3 m~Î Abymv‡i,V1S1e1 V2S2e2 1 20 1 2 = V2 106 510 2 V2 = 9.43 [∵S2 = 10x M = 10 5 106 ]

410 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES Item-02 Df‡qi fi D‡jøL _vK‡j (n = m M ) t Ex.1: 10g †divm mvj‡dU‡K RvwiZ Ki‡Z KZ MÖvg weï× K2Cr2O7 cÖ‡qvRb n‡e? GENERAL RULES (Written) 3 in 1 TRICKS & TIPS (TnT) K2Cr2O7 294.2 + 7H2SO4 + 6FeSO4 911.1 = K2SO4 + Cr2(SO4)3 + 3Fe2(SO4)3 + 7H2O mgxKiY †_‡K †`Lv hvq †h, 911.1 g FeSO4 †K RvwiZ Ki‡Z 294.2g K2Cr2O7 cÖ‡qvRb nq 10g Ó Ó Ó 294.2 10 911.1 = 3.23 g 6FeSO4 K2Cr2O7 ev, n1 e1 = n2 e2 ev, m1 M1 e1 = m2 M2 e2 ev, 10 152 1 = m2 294 6 m2 = 3.23 g Item-03 fi Ges AvqZb I NbgvÎv GK‡Î _vK‡j tÑ Ex.1: 2M 200 mL NaOH `ªeY cÖkgb Ki‡Z KZ MÖvg HCl jvM‡e? A. 16.57g B. 14.80g C. 14.06g D. 14.60g mwVK DËi: D. 14.60g e¨vL¨v: HCl = NaOH; 1 2 2 2 e V S e M m , 1 0.2 2 1 36.5 m m = 14.6 g (m =?, M = 36.5,V2 = 0.200dm3 , S2 = 2M, e2 = 1= e1) Item-04 GKvwaK GwmW I ÿv‡ii wgkª‡bi ‡ÿ‡Î tEx.1: 20cm3 ‡mwg‡gvjvi HCl, 15cm3 ‡gvjvi H2SO4 Ges 60cm3 †Wwm‡gvjvi HNO3 `ªeY GK‡Î wgwkªZ Kiv n‡jv| G GwmW wgkªY‡K cÖkwgZ Ki‡Z 100cm3 AvqZ‡bi KZ †gvjvi NaOH `ªeY cÖ‡qvRb? GLv‡b, cÖkgbKvix = 20cm3 1 2 M HCl + 15cm3 1M H2SO4 + 60cm3 1 10 M HNO3 Ges cÖkwgZ = 100cm3 NaOH m~Îvbymv‡i, (200.51) + (1512) + (600.11) = 100S1 0.46M(Ans) 100 10 30 6 S †UKwbKt hvi gvb †P‡q‡Q Zv‡K GKcv‡k †i‡L evwKme Ab¨cv‡k †i‡L †hvM Ki‡e| we‡kl wb‡`k©bvt wewµqvq AskMÖnbKvix GwmW¸‡jv GKcv‡k Ges ÿviK/jeY/avZz Ab¨cv‡k †i‡L †hvM K‡i cÖ‡qvRbxq gvb wbY©q Ki‡Z n‡e| Item-05 bigvwjwU Gi †ÿ‡ÎtÑ Ex.1: 5M Na 2CO3 25mL 1. ‡K cÖkwgZ Ki‡Z 50mL KZ normal acid jvM‡e? mgvavbt Na 2CO3 Acid ; 1 1 1 V2N2 VS e ; 5 2 50 N2 251. ; N2 1.5N Item-06 cvwb‡hvM ev cvwb Acmvi‡Yi †ÿ‡Î tÑ Ex-1 6.0 M NbgvÎvi †Kvb `ª‡ei 0.50L `ªe‡Y KZ wjUvi cvwb †hvM Kiv n‡j NbgvÎv 2.0M n‡e? e¨vL¨v: V1S1 = V2S2 6.00.50 = V2 2.0 V2 = 1.5 L cvwb cÖ‡qvRb = V2 V1 1.5-.5 = 1 wjUvi Ex-2 3L AvqZb wewkó 2M HCl G 5L cvwb ‡hvM Kiv nj| Ae‡kl `ªe‡Yi NbgvÎv KZ? e¨vL¨v: n=VS=32=6mol Ae‡kl `ªe‡Yi NbgvÎv = 0.75M 5 3 6 Item-07 A¤øwgwZ ÿviwgwZ msµvšÍ MvwYwZK cÖ‡qvM [weÁvb I cÖhyw³ wek¦we`¨vj‡qi Rb¨] Ex-01: 61.33cm3 0.033M K2Cr2O7 `ªeY‡K m¤ú~Y©iƒ‡c UvB‡UªU Ki‡Z 47.65cm3 FeSO4 `ªeY jv‡M| FeSO4 `ªe‡Yi †gvjvwiwU MYbv Ki| Tech. Law. hv PvIqv n‡q‡Q Zv‡K ev‡g ivL| FeSO4 K2Cr2O7 V1S1e1 = V2S2e2 ev, 47.65×S1×1 = 61.33×0.033×6 ev, 47.65 1 61.33 0.033 6 1 S = 0.255 M Gevi †`L‡j‡Zv! wKfv‡e mgxKiY bv †j‡L ïay Zzj¨msL¨v †R‡bB AsK †kl| Ex-02: jNy mvjwdDwiK GwmW wgwkªZ 19.8ml 0.02M KMnO4 `ªeY Øviv 25ml FeSO4 †K c~Y©fv‡e RvwiZ Kiv hvq| FeSO4 Gi NbgvÎv KZ? Tech. Law. V1S1e1=V2S2e2 1 1 2 2 2 1 V e V S e S = 0.079 25 1 19.8 0.02 5 wK As‡Ki †P‡q mgvavb †QvU - ZvB bv!

CHEMISTRY PLUS cwigvYMZ imvqb 411 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES Ex-03: jNyH2O2 Gi †Kvb `ªe‡Yi 25ml UvB‡UªU Ki‡Z 10 ml 0.1 M Na2S2O3 cÖ‡qvRb nq| H2O2 Gi NbgvÎv KZ? Tech. Law. H2O2Na2S2O3 V1S1e1 = V2S2e2 25 2 10 0.1 1 1 S = 0.02M Gevi e‡jv Lye wK KwVb! Ex-04: 2.5 gm f‡ii weï× CaCO3 ‡K 100 cm3 AvqZ‡bi GKwU HCl `ªe‡Y m¤ú~Y©iƒ‡c `ªexf~Z Kiv nj| cÖvß `ªeY‡K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 100cm3 ‡mwg †gvjvi KwóK †mvWvi `ªeY cÖ‡qvRb nj| HCl `ªe‡Yi NbgvÎv KZ? Solution: CaCO3+NaOH HCl; m M e + V1S1e1 = V2S2e2 m~Îvbymv‡i, S 1 1000 100 1 2 1 1000 100 2 100 2.5 HCl SHCl = 1M (Ans) Ex-05: 0.164gm f‡ii GK UzKiv `¯Ív‡K 200cm3 H2SO4 ‡gvjvi `ªe‡Y `ªexfyZ Kivi ci `ªe‡Yi Aewkó GwmW‡K cÖkwgZ Ki‡Z 50cm3 0.1M Na2CO3 `ªeY cÖ‡qvRb n‡jv| g~j `ªe‡Yi NbgvÎv KZ? mgvavbt GLv‡b cÖkgbKvix = 0.164gm Zn+50cm3 0.1M Na2CO3 (†`Iqv Av‡Q) Ges cÖkwgZ = 200cm3 H2SO4 (PvIqv n‡q‡Q) Tech. Law. m M e + V1S1e1 = V2S2e2m~Îvbymv‡i, S 2 1000 200 0.1 2 1000 50 2 65.4 0.164 H2SO4 SH2SO4 = 0.0375M (Ans) Ex-06: GK UzKiv g¨vM‡bwmqvg‡K 40 cm3 M 5 1 HCl `ªe‡Y m¤ú~Y©iƒ‡c `ªexf~Z Kiv n‡jv| `ªe‡Yi AwZwi³ GwmW cÖkwgZ Ki‡Z 60 cm3 NaOH 10 M cÖ‡qvRb n‡j Mg UzKivi fi KZ wQj| [Gi cvigvYweK fi = 24.3] mgvavbt GLv‡b cÖkgbKvix = x gm Mg + 60cm3 10 1 M NaOH Ges cÖkwgZ = MHCl 5 1 40cm3 Tech. Law. m M e + V1S1e1 = V2S2e2m~Îvbymv‡i, 1 5 1 1000 40 1 10 1 1000 60 2 24.3 m m 0.0243g (Ans) Ex-07: 2.7 gm f‡ii †Kvb GK A¤øxq ÿvi‡K cvwb‡Z `ªexf~Z K‡i 200 cm3 `ªeY cÖ¯‘Z Kiv n‡jv| H `ªeY‡K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 67.5 cm3 †gvjvi HCl `ªeY cÖ‡qvRb n‡jv| ÿviwUi AvYweK fi KZ? Tech. Law. m~Îvbymv‡i, m M e1 = vse2 2.7 M 1 = 67.5 1000 1 1 1 1 1000 67.5 1 2.7 M e vse M m M = 40 (Ans) Ex-08: GKwU A‡¤øi 200 cm3 0.5M `ªeY‡K cÖkwgZ Ki‡Z 375cm3 0.4M Ca (OH)2 `ªeY cÖ‡qvRb nq| A¤øwUi ÿviKZ¡ KZ? mgvavbt ÿviKZ¡ = Zzj¨msL¨v = e = x m~Îvbymv‡i, 0.2×0.5×x = 0.375×0.4×2 x = 3. (Ans) Ex-09: GK UzKiv Zn, 1.0gm CaCO3 Ges 200cm3 0.1M NaOH `ªeY Øviv 200 cm3 †mwg‡gvjvi H2SO4 Ges 100cm3 †gvjvi HCl Gi GKwU wgkªb cÖkwgZ nq| Zn UzKivi fi KZ? [BUET. 2001-02] Tech. Law. GLv‡b cÖkgbKvix=Zn, CaCO3 Ges NaOH Ges cÖkwgZ =H2SO4 Ges HCl m~Ît e vse vse vse M m e M m m~Îvbymv‡i, 2 0.2 0.1 1 100 1 2 65.4 m 0.20.520.111 m = 8.5gm (Ans) Ex-10: 200cm3 M 4 GKwU wÎÿvixq A¤ø`ªeY‡K cÖkwgZ Ki‡Z 400cm3 GKwU wØ-A¤øxq ÿvi `ªeY cÖ‡qvRb nj| ÿvi `ªe‡Yi kw³gvÎv †gvjvwiwU‡Z KZ? Tech. Law. m~Ît VASAeA = VBSBeB m~Îvbymv‡i, 3 400 2, 4 1 200 SB SB = 0.1875 M (Ans) Ex-11: cÖkgb wewµqv Kx? 10 wgwj 1 N HCl `ªe‡Y 10 wgwj 0.8 N NaOH `ªeY †hvM Ki‡j wgkÖ‡Yi pH KZ n‡e? [PUST. 2019-20] mgvavbt †h wewµqvq GwmW I ÿvi wewµqv K‡i jeY I cvwb Drcbœ K‡i, †mwU cÖkgb wewµqv| NaOH + HCl NaCl + H2O GLv‡b, 10 ml 1 N HCl G †gvj msL¨v = 10 10 1000 = 0.01 Ges 10 ml 0.8 N NaOH G †gvj msL¨v = 0.8 10 1000 = 0.008 A_©vr, Aewkó HCl †gvjmsL¨v = 0.002 ; wgkÖ‡Yi AvqZb = (10 + 10) = 20 wgwj wgkÖ‡Yi H + NbgvÎv = 0.002 1000 20 = 0.1 M pH = – log (0.1) = 1 Gevi ey‡qU, fvwm©wUi mg¯Í AsK mgvavb Ki‡e| bv cvi‡j eyS‡Z cvi‡ev Zzwg m~ÎwU ai‡Z cviwb| Zzwg ZLb †gvj msL¨v I Zzj¨msL¨v ey‡S Avevi Problem-1 †_‡K Problem-10 ch©šÍ mgvavb †`L‡e| Kx ZvI cvi‡e bv?

412 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. GKwU 1.0 M †mvwWqvg nvB‡Wªv·vB‡Wi Rjxq `ªe‡Yi 100 mL-†K m¤ú~Y©fv‡e wbi‡cÿ Ki‡Z KZ AvqZb 0.5 M A·vwjK GwmW cÖ‡qvRb co‡e? [DU.2013-2014] A. 50mL B.100 mL C. 200 mL D. 400 mL mwVK DËi: B.100 mL e¨vL¨v: NaOHH2C2O4, V1S1e1 = V2S2e2 1001.01 = V0.52 V = 100 mL 02. 10.0 wg.wj. NaOH `ªeY‡K 0.12 M NbgvÎvi 15.0 wg.wj. A·vwjK GwmW Øviv UvB‡Uªkb Ki‡j cÖkgb we›`y cvIqv hvq| NaOH Gi NbgvÎv KZ? [DU. 2012-2013, SUST-B. 2011-12] A. 0.25 M B. 0.36 M C. 0.32 M D. 0.40 M mwVK DËi: B. 0.36 M e¨vL¨v: NaOH = H2C2O4 V1S1e1 = V2S2e2 10 S1 1 = 15 0.122 V2 = 0.36 03. 0.5 M H2SO4 Gwm‡Wi 20.5mL Øviv 20 mL KwóK †mvWv `ªeY cÖkwgZ nq| H ÿvi `ªe‡Yi †gvjvwiwU KZ? [DU.2011 – 2012] A. 1.025 molL1 B. 0.1025 molL1 C. 0.5125 molL1 D. 0.025 molL1 mwVK DËi: A. 1.025 molL1 e¨vL¨v: H2SO4 = NaOH V1S1e1 = V2S2e2 20.5 0.5 2 = 20 S1 V2 = 1.025 04. 5Fe2+ + MnO– 4 + 8H+ 5Fe3+ + Mn2+ + 4H2O wewµqv‡Z 1000mL 1 M KMnO4 `ªeY KZ MÖvg Fe2+ ‡K RvwiZ Ki‡e?[ Fe Gi cvigvbweK fi 55.85] [DU.2010-2011] A. 350.55g B. 279.25g C. 55.85g D.25.85g mwVK DËi: B. 279.25g e¨vL¨v: KMnO4 = Fe2+ n1e1 = n2e2 VSe1 = m M e2 115 = 1 55.85 m m = 279.25gm 05. 20 mL 0.1M Fe++ `ªeY UvB‡Uªk‡bi Rb¨ KZ AvqZb 0.1M KMnO4 `ªe‡Yi cÖ‡qvRb n‡e- [DU.2008-2009] A. 4 mL B. 5 mL C. 10 mL D. 20 mL mwVK DËi: A. 4 mL e¨vL¨v: Fe2+ KMnO4 V1S1e1 = V2S2e2 ev, 20 0.11 = 0.1V25 ev, V2 = 4 ml Gevi ‡`L‡j †Zv †Kej Zzj¨ msL¨v †R‡bB UvB‡Uªk‡bi GB AsKwU KZ mn‡RB Kiv †Mj| †Zvgv‡`i ïay g‡b ivL‡Z n‡e Zzj¨ msL¨v I hvi hv gvb Zvi cv‡k emv‡bv| 06. 250.0 cm3 0.5M Na2CO3 `ªeY m¤ú~Y©fv‡e cÖkwgZ Ki‡Z wK cwigvY 0.25 M HCI `ªe‡Yi cÖ‡qvRb n‡e? [DU.2007-2008] A. 250 cm3 B. 125 cm3 C. 1000 cm3 D. 500 cm3 mwVK DËi: C. 1000 cm3 e¨vL¨v: HCl Na2CO3 V1S1e1 = V2S2e2 V×0.25×1 = 250×0.5×2 V = 1000cm3 07. 8.0 cm3 Na2CO3 Gi `ªeY‡K m¤ú~Y©iƒ‡c cÖkgb Ki‡Z 10.0 cm3 1.0 M HCl `ªe‡Yi cÖ‡qvRb nq| Na2CO3 `ªe‡Yi NbgvÎv n‡”Q- [DU.2006-2007] A. 0.625 M B. 1.0M C. 0.025 M D. 0.6 M mwVK DËi: A. 0.625 M e¨vL¨v: Na2CO3 HCl V1S1e1 = V2S2e2 8S12 = 1011 S1 = 10 16 = 0.625M 08. 6.0 M NbgvÎvi †Kvb `ª‡ei 0.50L `ªe‡Y KZ wjUvi cvwb †hvM Kiv n‡j NbgvÎv 2.0M n‡e? [DU.2005-2006] A. 0.30L B. 1.0L C. 1.5L D. 3.0L mwVK DËi: B. 1.0L e¨vL¨v: V1S1 = V2S2 6.00.50 = V2 2.0 V2 = 1.5 L (GLv‡b Zzj¨ msL¨v e `iKvi †bB †Kbbv GKvwaK eš‧i bvg D‡jøL †bB)| cvwb cÖ‡qvRb = 1.5-.5 = 1 wjUvi 09. 0.05 molL-1 NbgvÎv 10.0 mL A·vwjK GwmW `ªeY‡K cÖkwgZ Kivi Rb¨ 0.05 molL-1 NbgvÎvi †h AvqZ‡bi NaHCO3 `ªeY cÖ‡qvRb Zv nj- [DU.2005-06] A. 2 mL B. 5 mL C. 40 mL D. 20 mL mwVK DËi: D. 20 mL e¨vL¨v: H2SO4 = NaHCO3 V1S1e1 = V2S2e2 0.0510 2 = V2 0.051 V2 = 20 ml 10. 100mL 0.01M Na2CO3 `ªeY‡K cÖkwgZ Kivi Rb¨ 0.2M HCl `ªe‡Yi †h AvqZb cÖ‡qvRb n‡e [DU.2004-2005, KUET. 2011-12] A. 4.0 mL B. 10.0 mL C. 2.0 mL D. 20.0 mL mwVK DËi: B. 10.0 mL e¨vL¨v: HCl Na2CO3 V1S1e1 = V2S2e2 V1 0.21 = 100 0.012 V1 = 10 ml Zzj¨ msL¨v g‡b ivL‡e Avi hvi hv gvb Zvi cv‡k emv‡e | 11. 10.0mL 0.2 M KMnO4 Gi GwmwWK Rjxq `ªeY KZ mL 0.2M Na2C2O4 Gi Rjxq `ªe‡Y †hvM Ki‡j Na2C2O4 m¤ú~Y© RvwiZ n‡e? [DU.2002-2003] A. 25 B. 10 C. 20 D. 50 mwVK DËi: A. 25 e¨vL¨v: ïay Zzj¨ msL¨v g‡b ivL‡e| Na2C2O4 KMnO4 V1S1e1 = V2S2e2 0.2V12 = 10.00.25 = 25 12. 40 mL 0.05M HCl cÖkwgZ Ki‡Z 0.1MNaOH `ªe‡Yi †h AvqZb jvM‡e- [DU.1998-1999, wm.‡ev. 2016, w`.‡ev. 2015] A. 10.0 ml B. 15.0 ml C.20.0 ml D. 40.0 ml mwVK DËi: C. 20.0 ml e¨vL¨v: NaOH HCl V1S1e1 = V2S2e2 V10.11 = 400.051 V1 = 20 13. 1.5M NaOH `ªe‡Yi 50mL cÖkgb Ki‡Z 2.5M H2SO4 Gwm‡Wi †h cwigvY jvM‡e- [DU.1998-1999] A. 50 mL B. 15 mL C. 37 mL D. 30 mL mwVK DËi: B. 15 mL e¨vL¨v: H2SO4 NaOH V1S1e1 V2S2e2 V1 2.5 2 = 50 1.5 + 1 V1 = 15

CHEMISTRY PLUS cwigvYMZ imvqb 413 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES JnU 01. 750 mL 0.5 M H2SO4 cÖkwgZ Ki‡Z KZ wjUvi 1 M NaOH `ªe‡Y jvM‡e? [JnU:2010-2011] A. 750 B. 75 C.0.75 D. 3.75 mwVK DËi: C.0.75 e¨vL¨v: NaOH H2SO4 V1S1e1 = V2S2e2 V111 = 0.7500.52 V1 = 0.75 JU 01. 10 mL 0.105 M Na2CO3 `ªeY‡K c~Y© cÖkwgZ Ki‡Z 10.5 mL HCl `ªe‡Yi cÖ‡qvRb n‡j GwmW `ªe‡Yi †gvjvi NbgvÎv KZ? [JU-D,A : 2018-19] A. 0.1 M B. 0.01 M C. 0.2 M D. 0.02 M mwVK DËi: C. 0.2 M e¨vL¨v: 0.2 10.5 1 10 0.105 2 V1S1 e1 V2S2 e2 S2 M 02. 15.2 MÖvg FeSO4 †K RvwiZ Ki‡Z KZ MÖvg K2Cr2O7 jvM‡e? [JU-D5.2017-18, JUST. 2017-18] A. 8.15 B. 8.25 C. 4.9 D. 4.25 mwVK DËi: C. 4.9 e¨vL¨v: n1e1 = n2e2 ev, 2 2 2 1 1 1 M w e M w e w2 = 4.9 152 6 15.2 1 294 1 2 1 1 2 M e w e M g 03. 8.0 cc Na2CO3 Gi `ªeY‡K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 10.0 cc 1M HCl `ªe‡Yi cÖ‡qvRb nq| Na2CO3 `ªeYwUi NbgvÎv KZ? [JU:2013-2014] A. 0.775 M B. 1.625 M C. 0.625 M D. 1.775 M mwVK DËi: C. 0.625 M e¨vL¨v: Avgiv Rvwb, 1 1 1 2 2 2 V S e V S e 8 s 2 10 1 1 1 s1 0.625M 04. 50 mL CuSO4 `ªe‡Y AwZwi³ Kl ‡hvM K‡i wegy³ Av‡qvwWb‡K UªvB‡Uªkb Ki‡Z 0.15 M Na2S2O3 Gi 35 mL cÖ‡qvRb n‡j D³ `ªe‡Y Cu2+ Avq‡bi cwigvY KZ? [JU.2011-12, RU-H. 2014-15] A. 0.25 g B. 0.3 g C. 0.33 g D. 0.36g mwVK DËi: C. 0.33 g e¨vL¨v: Cu2+ = Na2S2O3 ; 1 2 2 2 e V S e M m 1 0.035 0.15 1 63.5 m m = 0.33g (m =?, M = 63.5 g, V2 = 0.035 L, S2 = 0.15 M, e1=e2=1) 05. 50 mL CuSO4 `ªe‡Y AwZwi³ Kl ‡hvM K‡i wegy³ Av‡qvwWb‡K UvB‡Uªkb Ki‡Z 0.2M Na2S2O3 Gi 35 mL cÖ‡qvRb n‡j D³ `ªe‡Y Cu2+ Avq‡bi cwigvY KZ? [JU.2011-2012] A. 0.25 g B. 0.34 g C. 0.40 g D. 0.44 g mwVK DËi: D. 0.44 g e¨vL¨v: Cu2+ = Na2S2O3 1 2 2 2 e V S e M m 1 0.035 0.2 1 63.5 m m = 0.44g (m =?, M = 63.5g, V2 = 0.035L, S2 = 0.2M, e1=e2=1) RU 01. 10 mL 0.5 M Na2CO3 `ªeY‡K 0.05 M `ªe‡Y cwiYZ Ki‡Z Kx cwigvY cvwb †gkv‡Z n‡e? [RU. 2019-20] A. 80 mL B. 90 mL C. 100 mL D. 110 mL mwVK DËi: B. 90 mL e¨vL¨v: V2 = V1S1 S2 = 0.5 10 0.05 = 100 ml cvwb wgkv‡Z n‡e (100 10) = 90 ml 02. Kw÷K †mvWvi 20 mL `ªeY‡K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 25 mL 0.5 M H2SO4 Gi cÖ‡qvRb n‡j ÿvi `ªe‡Yi †gvjvwiwU n‡eÑ [RU. 2019-20] A. 1.25 B. 1.20 C. 0.80 D. 1.05 mwVK DËi: A. 1.25 e¨vL¨v: NaOH + H2SO4 H2O + Na2SO4 n = sv 1000 = 0.5 25 1000 = 0.0125 mol 1 mol H2SO4 2 mol NaOH 0.0125 ” 2 0.0125 1 = 0.025 mol NaOH S = n 1000 V = 0.025 1000 20 = 1.25 M Shortcut: NaOH H2SO4 V1S1e1 = V2S2e2 20 S1 1 = 25 0.5 2 S1 = 1.25 M 03. 25.0 mL 0.100 M Na2CO3-†K cÖkwgZ Ki‡Z 20.0 mL H2SO4 cÖ‡qvRb n‡j, GwmW `ªe‡Yi NbgvÎv- [RU-C3. 17-18, JU-A. 2016-17] A. 0.125 M B. 0.250 M C. 0.215 M D. 1.25 M mwVK DËi: A. 0.125 M e¨vL¨v: v1s1e1 = v2s2e2 S2 = v1s1e1 v2e2 = 250.12 202 = 0.125 04. 0.1 ‡gvjvi NbgvÎvi 500 HCl `ªeY •Zix Ki‡Z 12 †gvjvi NbgvÎvi KZ wgwjwjUvi HCl jvM‡e? [RU-F3.2017-18] A. 4.2 ml B. 5.2 ml C. 6.2 ml D. 7.2 ml mwVK DËi: A. 4.2 ml e¨vL¨v: V2S1 = V2S2 V1 = V2S2 S1 = 0.1 500 12 = 4.16 4.2ml 05. 0.01M, 100 ml KMnO4 `ªe‡Y `ªve‡Ki cwigvY- [RU-H3.17-18,w`.‡ev. 15] A. 0.158 g B. 1.58 g C. 1.58 gm D. 15.8 gm mwVK DËi: A. 0.158 g e¨vL¨v: W = V(L)SM = 0.1 0.01 158 = 0.158g 06. 0.1 wjUvi cwigvY 0.2 †gvjvi HCl `ªeY‡K cÖkwgZ Ki‡Z KZ MÖvg KOH cÖ‡qvRb n‡e? [RU-H1.2017-18] A. 1.12 g B. 11.2 g C. 56 g D. 28 g mwVK DËi: A. 1.12 g e¨vL¨v: n1e1=n2e2 1 e M w = vse1 w= 1 2 e Mvse = 1 56 0.10.21 =1.12g 07. 10ml Kw÷K cUvk (KOH) cÖkwgZ Ki‡Z 20 ml 1M H2SO4 `ªe‡Yi cÖ‡qvRb nq| KOH `ªe‡Yi †gvjvi NbgvÎv KZ? [RU-H2.2017-18] A. 2M B. 1M C. 4M D. 0.5 M mwVK DËi: C. 4M e¨vL¨v: v1s1e1 = v2s2e2 s1= 1 1 2 2 2 v e v s e = 10 1 20 1 2 = 4M

414 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 08. 1ml 1.0M A¤øxq K2Cr2O7 `ªeY Øviv KZ MÖvg Fe Avqb RvwiZ nq? [RU-2016-17] A. 33.0g B. 33.5×10-2 g C. 3.35×10-2 g D. 5.55g mwVK DËi: B. 33.5×10-2 g e¨vL¨v: M we1 = V2S2e2 ; W= V2S2e2M e1 = 0.001 1656 1 =33.5×10-2 g 09. 10 mL 0.1M HCI `ªeY‡K cÖkwgZ Ki‡Z KZ mL Gi 0.1 M Na2CO3 `ªeY cÖ‡qvRb? [RU-F. 2015-16] A. 10 mL B. 5 mL C. 15 mL D. 20 mL mwVK DËi: B. 5 mL e¨vL¨v: V1S1e1 = V2S2e2 0.11 1000 10 V2 0.1 2 V2 = 1000 5 = 0.005L=5 ml 10. 20 mL, 0.265 M H2SO4 `ªeY cÖkgb Ki‡Z KZ MÖvg Na2CO3 cÖ‡qvRb n‡e? [RU. 2012-2013] A. 0.567g B. 0.5851g C. 0.5618g D. 0.5721g mwVK DËi: C. 0.5618g e¨vL¨v: Na2CO3 = H2SO4 1 2 2 2 e V S e M m 2 0.02 0.265 2 106 m m = 0.561g m =?, M = 106, V2 = 0.02dm3 , S2 = 0.265M, e2 = 2= e1 11. 100 mL 0.5M Na2CO3 `ªeY †_‡K KZ mL 0.1M `ªeY •Zwi Kiv hv‡e? [RU. 2012-2013] A. 200 mL B. 350 mL C. 382 mL D. 500 mL mwVK DËi: D. 500 mL e¨vL¨v: Na2CO3 Na2CO3 V1S1e1 = V2S2e2 1000.52 = V20.12 V2 = 500 CU 01. 490 cm3 cvwb‡Z 10 cm3 1.0M HCl Gi `ªeY †hvM Kiv nj| wgkÖ‡Yi pH KZ? [CU-A.2019-20] A. 0.0 B. 1.0 C. 1.7 D. 2.0 mwVK DËi: C. 1.7 e¨vL¨v: V1S1 = V2S2 ev, S2 = V1S1 V2 ev, S2 = 10 1.0 500 ev, S2 = 0.02M GLv‡b, 1g †ÿ‡Î, AvqZb, V1 = 10 cm3 NbgvÎv, S1 = 1.0 m 2q, †ÿ‡Î, AvqZb, V2 = (490 + 10) cm3 = 500 cm3 NbgvÎv, S2 = ? pH = –log [0.02] = 1.7 02. 14.5 MÖvg Na2CO3 †K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z KZ MÖvg HCl cÖ‡qvRb n‡e? [CU-Ka.2016-17] A. 53.0g B. 36.5 g C. 12.5 g D. 9.98 g E. 10.0g mwVK DËi: D. 9.98 g e¨vL¨v: n1e1 = n2e2 2 2 2 1 1 1 e M m e M m 1 36.5 m 2 106 14.5 2 m2 9.98 03. 400cm3 GKwU Rjxq `ªe‡Y 2.00g Na2CO3(M = 106) `ªexf~Z Av‡Q| G `ªe‡Yi 25.0 cm3 m¤ú~Y©fv‡e cÖkwgZ Ki‡Z wK cwigvY 0.120 M HCl cÖ‡qvRb n‡e? [CU-G. 2016-17] A. 9.80cm3 B. 19.65cm3 C. 20.00cm3 D. 16.65cm3 mwVK DËi: B. 19.65cm3 e¨vL¨v: 2g Na2CO3 Gi NbgvÎv= 10002 106400 = 0.0472M v1s1e1 = v2s2e2 v2= v1s1e1 s2e2 = 250.04722 0.121 = 19.65 cm3 Z‡e total 400cm3 Na2CO3 †K cÖkwgZ Ki‡Z HCl Gi 314.5 cm3 `ªeY cÖ‡qvRb n‡e| 04. 5g Abv`ª© I weï× FeSO4 †K m¤ú~Y© RvwiZ Ki‡Z KZ MÖvg K2Cr2O7 cÖ‡qvRb? [CU. 2014-15, h.‡ev. 2015] A. 1.314g B. 1.416 g C. 1.514 g D. 1.614 g E. 1.694 g mwVK DËi: D. 1.614 g e¨vL¨v: 1mol FeSO4 6mol K2Cr2O7 ev, e M m e M m ev, 5 152 1 = m 294 6 m = 1.614 g 05. 5 mL 2N NaOH Ges 2mL 5N NaOH †K GK‡Î wgkv‡j `ªe‡Yi NbgvÎv n‡e- [CU:13-14] A. 3.5N B. 2.86N C. 3N D. 3.7N E. 2.5N mwVK DËi: B. 2.86N e¨vL¨v: 1 2 1 1 2 2 T V V V N V N N 2.86 5 2 5 2 2 5 06. 100 cm3 1M HCl †K cÖkwgZ Ki‡Z KZ MÖvg NaOH (AvbweK fi = 40) cÖ‡qvRb n‡e? [CU.09-10, 12-13] A. 4.0 MÖvg B. 0.4 MÖvg C. 8.0 MÖvg D. 0.8 MÖvg E. 10.0 MÖvg mwVK DËi: A. 4.0 MÖvg e¨vL¨v: NaOH HCl 1 2 2 2 e V S e M m m = 4g (m = ?, M = 40, V2 = 0.100dm3 , S2 = 1M, e2 = 1= e1) 07. 20 cm3 0.5M HCl-†K cÖkwgZ Ki‡Z 1.0N NbgvÎvi KZ AvqZb NaOH `ªe‡Yi cÖ‡qvRb n‡e? [CU.2011-2012] A. 2 cm3 B.5cm3 C.10cm3 D. 20 cm3 E. 50 cm3 mwVK DËi: C.10cm3 e¨vL¨v: NaOH HCl V1S1e1 = V2N2 ev, V11.01=200.51 ev, V1 = 10.0cm3 08. 10 cm3 0.5M HCl-†K cÖkwgZ Ki‡Z 1.0M NbgvÎvi KZ AvqZ‡bi NaOH Gi cÖ‡qvRb n‡e? [CU.2011-2012; CU-09-10] A. 5 cm3 B. 10cm3 C. 20 cm3 D. 25 cm3 E. 2.5 cm3 mwVK DËi: A. 5 cm3 e¨vL¨v: NaOH HCl V1S1e1 = V2S2e2 ev, V11.01=100.51ev, V1 = 5.0cm3 09. 10 cm3 NaOH `ªeY‡K cÖkwgZ (Neutralize) Ki‡Z 0.12 mol dm3 A·vwjK Gwm‡Wi 15cm3 `ªeY cÖ‡qvRb n‡j NaOH `ªe‡Yi NbgvÎv KZ? [CU.2011-2012] A.0.36 mol dm3 B.0.036moldm3 C. 0.018 mol dm 3 D. 0.18 mol dm3 mwVK DËi: A. 0.36 mol dm3 e¨vL¨v: NaOH C2H2O4 V1S1e1 = V2S2e2 10S11 = 150.122S1 = 0.36 10. 20cm3 0.05M H2SO4 †K cÖkwgZ Kivi Rb¨ KZ AvqZ‡bi 0.1M NaOH `ªe‡Yi cÖ‡qvRb n‡e? [CU. 10-11] A. 25cm3 B. 20cm3 C. 15cm3 D. 10cm3 E. 5cm3 mwVK DËi: B. 20cm3

CHEMISTRY PLUS cwigvYMZ imvqb 415 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES e¨vL¨v: NaOH H2SO4 V1S1e1 = V2S2e2 V10.11 = 200.052 V1 = 0.02 dm3 =20cm3 11. 0.250 molar 110 cc mvjwdDwiK GwmW `ªeY‡K m¤ú~Y© cÖkwgZ Ki‡Z 0.125 †gvjv‡ii KZ wmwm †mvwWqvg Kve©‡bU `ªeY cÖ‡qvRb n‡e? [CU.2008-2009] A. 440 cm3 B. 55 cm3 C. 110 cm3 D. 220 cm3 mwVK DËi: D. 220 cm3 e¨vL¨v: v1s1e1 = v2s2e2 0.25 110 2 = v2 0.125 2 v2 = 220 12. 60 c.c. 6 M H2SO4 cÖ¯‘Z Ki‡Z 36 M H2SO4 KZ c.c. wb‡Z n‡e? [CU.2008-2009] A. 20 B. 30 C. 60 D. 10 mwVK DËi: D. 10 e¨vL¨v: v1s1 = v2s2 60 6 = 36 v2 v2 = 10 13. 10 ml 0.4 M NaOH Gi `ªeY‡K m¤ú~Y© cÖkwgZ Ki‡Z KZ AvqZ‡bi 1.6 M H2SO4 Gi `ªeY jvM‡e? [CU.2008-09, PUST. 2018-19] A. 1.85 ml B. 2.0 ml C. 1.95 ml D. 1.25 ml mwVK DËi: D. 1.25 ml e¨vL¨v: H2SO4 NaOH v1s1e1 = v2s2e2 1.6 v1 2 10 0.4 1 V1 = 1.25 14. 50mL 0.01M NaOH `ªe‡Y Avi wK cwigvY cvwb †hvM Ki‡j NbgvÎv 0.02 M -G `uvov‡e? [CU.2006-2007, JUST. 2016-17] A. 150 mL B. 200 mL C. 25 mL D. 30 mL mwVK DËi: C. 25 mL e¨vL¨v: V1S1 = V2S2 500.01 = 0.02V2 V2 = 25 (cvwb †hvM Ki‡Z n‡e = V1 - V2 = 50-25 = 25 ml) 15. 10 cm3 H2SO4 Gi GKwU `ªeY‡K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 0.1M NaOH `ªe‡Yi 8.0cm3 jv‡M| H2SO4 `ªeYwUi NbgvÎv †gvjvwiwU‡Z KZ n‡e? [CU.2006-2007] A. 0.05 M B. 0.5 M C. 0.04 M D. 0.16 M mwVK DËi: C. 0.04 M e¨vL¨v: H2SO4 NaOH V1S1e1 = V2S2e2 10×S1×2 = 8.0×0.1×1 S1 = 0.04M 16. 10.0mL 0.1 M Na2CO3 ‡K UvB‡Uªkb Ki‡Z 0.2M HCl Gi jvM‡e- [CU.2006-2007] A. 5.0mL B. 20.0mL C.10.0mL D. 15.0mL mwVK DËi: C. 10.0mL e¨vL¨v: HClNa2CO3 V1S1e1 = V2S2e2 V1×0.2×1 = 10.0×0.01×2 V1 = 10ml 17. GKwU 0.10M H2SO4 `ªe‡Yi AvqZb 400 mL| GB `ªeY‡K jNy K‡i Gi NbgvÎv 0.080M Ki‡Z cvwb †hvM Ki‡Z n‡e: [CU.2006-2007] A. 30mL B. 500mL C. 70mL D. 100mL mwVK DËi: D. 100mL e¨vL¨v: V1S1e1 V2S2e2 400×0.1×2 = V2×0.08×2 V2 = 500 cvwb †hvM Ki‡Z n‡e 500-400 = 100 wgwj wjUvi 18. ARvbv NbgvÎvi 25.0 mL H2SO4 `ªeY‡K cÖkwgZ Ki‡Z 0.25M NbgvÎv 28.0 mL NaOH cÖ‡qvRb nq| H2SO4 `ªe‡Yi NbgvÎv: [CU.2006-2007] A. 0.14 M B. 0.025 M C. 0.10 M D. 0.20 M mwVK DËi: A. 0.14 M e¨vL¨v: H2SO4 NaOH V1S1e1 = V2S2e2 25 S 2 = 0.25 28 1 S = 0.14 19. 10 cm3 0.5 M H2SO4 †K cÖkwgZ Ki‡Z 1.0 M NbgvÎv KZ AvqZb NaOH jvM‡e? [CU.2004-2005] A. 20 cm3 B. 10 cm C. 5 cm3 D. 2.5 cm3 mwVK DËi: B. 10 cm3 e¨vL¨v: NaOH H2SO4 V1S1e1 = V2S2e2 V11.01 = 100.52V1 = 10 cm3 KU 01. evRv‡ii evwYwR¨K nvB‡Wªv‡K¬vwiK GwmW n‡jv 12.0M Rjxq `ªeY| D³ evwYwR¨K Gwm‡Wi 300 mL G KZ †gvj nvB‡Wªv‡K¬vwiK GwmW i‡q‡Q? [KU-A.2017-18] A. 2.60 B. 3.60 C. 4.60 D. 5.60 mwVK DËi: B. 3.60 e¨vL¨v: n = V(L) S = 0.3 12 = 3.60 02. 25.0 ml AvqZ‡bi GKwU Na2CO3 Gi Rjxq `ªeY‡K cÖkwgZ Ki‡Z 10.2 ml AvqZ‡bi 0.05M H2SO4 `ªe‡Yi cÖ‡qvRb nq| Na2CO3 `ªe‡Yi NbgvÎv KZ? [KU. 2015-16] A. 0.204M B. 0.0204M C. 0.014M D. 0.04M mwVK DËi: B. 0.0204M e¨vL¨v: 3 CO 2 Na S = 10.20.05 25 =0.0204M 03. 5.6 MÖvg KOH ‡K cÖkwgZ Ki‡Z KZ MÖvg IR‡bi HCl `iKvi? [KU. 2014-15] A. 36.5 B. 3.65 C. 56 D. 1 mwVK DËi: B. 3.65 e¨vL¨v: 5.6 56 1 = m 36.5 1 m = 3.65 04. 2.40g FeSO4-†K H2SO4 `ªe‡Y RvwiZ Ki‡Z KZ MÖvg KMnO4 jvM‡e MYbv Ki? [KU. 2012-2013] A. 0.2 g B. 0.3g C. 0.4g D. 0.5g mwVK DËi: D. 0.5g e¨vL¨v: 1mol FeSO4 5mol KMnO4 ev, m1 M1 e1 = m2 M2 e2 ev, 2.4 152 1 = m2 158 5 m2 = 0.5g CoU 01. 500 ml 0.5 M NaOH `ªeY n‡Z ‡mw›U‡gvjvi `ªeY •Zix Ki‡Z wK cwigvY cvwbi cÖ‡qvRb? [CoU-A. 2016-17] A. 2000 ml B. 25000 ml C. 2500 ml D. 24500 ml mwVK DËi: B. 25000 ml e¨vL¨v: ‡mw›U‡gvjvi `ªeY •Zwi‡Z cÖ‡qvRb- = 5000.5 0.01 = 25000ml IU 01. 25 wgwj 0.1 ‡gvjvi Na2CO3 Gi Rjxq `ªeY‡K cÖkwgZ Ki‡Z 0.1 bigvj H2SO4 cÖ‡qvRb n‡e- [IU. 2014-15] A. 12.5 mL B. 25 mL C. 50 mL D. 2.5 mL mwVK DËi: C. 50 mL e¨vL¨v: V1S1e1 = V2S2e2 V2 = 25 0.1 2 0.1 = 50 mL [N= Se] 02. 10 cc H2SO4 `ªeY‡K m¤ú~Y©iƒ‡c cÖkwgZ Ki‡Z 0.1 N NaOH `ªe‡Yi 8 cc jv‡M| H2SO4 `ªe‡Yi NbgvÎv †gvjvwiwU‡Z- [IU.11-12, JUST. 13-14] A. 0.1 M B. 0.04M C. 0.08 M D.0.02 M mwVK DËi: B. 0.04M e¨vL¨v: H2SO4 NaOH V1S1e1 = V2S2e2 10 S 2 = 8 0.1 1 S = 0.04

416 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES BRU 01. 200mL 0.05M NaOH `ªe‡Y KZ MÖvg NaOH `ªexf~Z Av‡Q? [BRU-D1.2017-18, JU. 2017-18] A. 0.4 B. 0.5 C. 0.1 D. 0.04 mwVK DËi: A. 0.4 e¨vL¨v: w = V(L)S(M)M = 0.20.05 40 = 0.4g BU 01. 100cm3 Rjxq `ªeY‡K cÖkwgZ Ki‡Z 100cm3 0.2M oxalic acid `ªeY cÖ‡qvRb| NaOH `ªe‡Yi ‡gvjvwiwU wbY©q Ki| [BU. 2015-16] A. 0.4M B. 0.3M C. 0.2M D. 0.1M mwVK DËi: A. 0.4M e¨vL¨v: SNaOH = 1000.22 100 = 0.4M NU-7Clg 01. 10.0 mL 0.20 M Ca (OH)2 `ªeY UvB‡Uªkb Ki‡Z KZ wgwjwgUvi (mL) 0.10 M HCl `ªe‡Yi cÖ‡qvRb n‡e? [N.U:2013-2014] A. 80.0 mL B. 40.0 mL C. 30.0 mL D. 20.0 mL mwVK DËi: B. 40.0 mL e¨vL¨v: HCl Ca (OH)2 VSe = VSe ev, V0.101 = 100.202 ev, v = 40 STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION SUST 01. 10 MÖvg FeSO4 †K m¤ú~Y©iƒ‡c RvwiZ Ki‡Z KZ MÖvg weï× K2Cr2O7 jvM‡e? [SUST-B. 2019-20] A. 6.44 B. 3.23 C. 4.23 D. 2.00 E. 19.34 mwVK DËi: B. 3.23 e¨vL¨v: 1mol K2Cr2O7 6mol FeSO4 m M e = m M e m 294 6 = 10 152 1 m = 3.23 02. GKwU weKv‡i 20mL 0.1MHCI Gi m‡½ 50mL, 0.1M, H2SO4 wgwkªZ Kiv nj| GB `ªe‡Y 60mL AÁvZ NbgvÎvi NaOH `ªeY wgwkªZ Ki‡j `ªeYwU m¤ú~Y© cÖkwgZ nq | NaOH `ªe‡Yi AÁvZ NbgvÎv KZ †gvjvi? [SUST-A.2016-17] A.0.10M B. 0.12M C. 0.20M D. 0.22M E. 0.24M mwVK DËi: C. 0.20M e¨vL¨v: NaOH Gi NbgvÎv = 0.2M 60 20 0.1 50 0.1 2 03. 16.8 g weï× †jvnv‡K jNy H2SO4 G `ªexf‚Z K‡i cÖvß `ªeY‡K UvB‡Uªkb Ki‡Z 0.1 M NbgvÎvi KZ wjUvi K2Cr2O7 cÖ‡qvRb n‡e? [Fe = 56g] [SUST 2012-2013, BSMRSTU. 2016-17] A. 1.0 B. 0.3 C. 0.9 D. 0.5 E. 1.2 mwVK DËi: D. 0.5 e¨vL¨v: 1mol K2Cr2O7 6mol Fe2+ 1 2 2 2 e V S e M m 16.8 56 1 = V2 0.1 6 V2 = 0.5g (m = 16.8, M = 98, V2 =?, S2 = 0.1M, e2 = 6, e1=2) 04. 1 M H2SO4 `ªeY †_‡K 100 mL 0.5 N Ges 50 mL 0.25 N `ªeY •Zwi Ki‡Z h_vµ‡g : [SUST.2010-2011] A. 25mL I 6.25 mL B. 50mL I 25 mL C. 100mL I 50 mL D. 50mL I 100mL cÖ‡qvRb n‡e| mwVK DËi: A. 25mL I 6.25 mL e¨vL¨v: H2SO4 Gi Rb¨ 25 2 100 0.5 50 1 1 e V Ges 6.25 2 50 0.25 12.5 2 1 e V 05. 10 M H2SO4 mg AvqZ‡bi KZ †gvjvi NaOH †K cÖkwgZ Ki‡e? [SUST.2006-2007, BSMRSTU. 2012-13] A. 0.4 M B. 0.3 M C. 0.2 M D. 0.5 M mwVK DËi: C. 0.2 M e¨vL¨v: VS1e1 VS2e2 V×0.1×2 = V×S2×1 S2 = 0.2 M JUST 01. 200 cm3 0.75M Na2CO3 `ªeY †_‡K KZ AvqZb (cm3 ) †Wwm‡gvjvi Na2CO3 `ªeY •Zwi Kiv hv‡e? [JUST-A: 2019-20] A. 15 B. 150 C. 1500 D. 1515 mwVK DËi: C. 1500 e¨vL¨v: We Know, V1S1 = V2S2 v2 = v1s1 s2 = 200 0.75 0.1 = 1500 cm3 02. 15.2g FeSO4 Gi m¤ú~Y© RvwiZ Ki‡Z KZ MÖvg K2Cr2O7 `iKvi n‡e? [JUST-C.2017-18] A. 8.15 g B. 8.25 g C. 4.25 g D. 4.15 g mwVK DËi: C. 4.25 g (KvQvKvwQ DËi) e¨vL¨v: n1e1 = n2 e2 2 1 2 2 1 1 2 2 2 1 1 1 m e w e m w m w e m w e = 15.21294.2 1526 = 4.9 g 03. 10g FeSO4 †K RvwiZ Ki‡Z KZ MÖvg weï× KMnO4 cÖ‡qvRb? [JUST-B. 2016-17, SUST. 2012-13] A. 1.0879 g B. 2.0965 g C. 2.0789 g D. 3.0888 g mwVK DËi: C. 2.0789 g e¨vL¨v: n1e1 = n2e2 ; 1 1 M W e1 = 2 2 M W e2 152 10 1 = 157.1 W2 5 ,W2 = 5 152 10 157.1 ; W2 =2.0789 g BSMRSTU 01. †Kvb wbw`©ó AvqZ‡bi M/20 H2SO4 Øviv mgAvqZ‡bi KZ †gvjvi NaOH `ªeY‡K c~Y© cÖkwgZ Kiv hv‡e? [BSMRSTU.Ka. 2016-17, PUST. 2012-13] A. 0.1 M B. 0.01 M C. 0.2 M D. 0.02 M mwVK DËi: A. 0.1 M e¨vL¨v: NaOH Gi NbgvÎv = 0.05×2 = 0.1M PUST 01. 500 mL 0.20 M Na2CO3 Gi `ªeY •Zix‡Z KZ MÖvg Na2CO3 jvM‡e? [PUST-B.2017-18] A. 10.6 B. 6.6 C. 10 D. 9.6 mwVK DËi: A. 10.6 e¨vL¨v: W = V(L) S(M) M = 0.5 0.2 106 = 10.6 gm CVASU 01. 250 ml K2Cr2O7 Gi 0.1N `ªeY •Zix Ki‡Z KZ MÖvg K2Cr2O7 jvM‡e? [CVASU:2018-19] A. 1.3321g B. 1.3251g C. 1.3521g D. 1.2257g mwVK DËi: D. 1.2257g e¨vL¨v: 1.225 6 0.1 1000 250 294 1000 MVS VS w M 1000W g

CHEMISTRY PLUS cwigvYMZ imvqb 417 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION BUET 01. wKWwb cv_‡ii cÖavb Dcv`vb K¨vjwmqvg A·v‡jU i³ †_‡K AvniY K‡i Gwm‡W `ªexf‚Z K‡i 9.56 10-4M KMnO4 Øviv UvB‡Uªkb Kiv nj| 10mL bgybv i‡³i Rb¨ 24.2 mL KMnO4 `iKvi nq cÖwZ wgwjwjUvi i‡³ Kx cwigvY K¨vjwmqvg Av‡Q wbY©q Ki Ges wewµqvmg~n †`LvI [Ca = 40] [BUET. 2018-19] e¨vL¨v: 5CaC2O4 + 2KMnO4 + 3H2SO4 K2SO4 + 2MnSO4 + 8H2O +10CO2 wewµqv Abymv‡i, V1S1e1 = V2S2e2 1 1 2 2 2 1 V e V S e S 0.0058M 10 2 24.2 2.56 10 5 4 WCa = 2.33 10 g 1000 40 0.0058 10 1000 MVS 3 10ml G Ca Av‡Q = 2.3310-3 g 1ml G Ca Av‡Q = g 10 2.33 103 = 2.3310-4 g 02. wgé Ae g¨vM‡bwkqvg nj g¨vM‡bwkqvg nvB‡Wªv·vB‡Wi Rjxq mvm‡cbkb hv mvaviYZ cvK¯’jxi GwmW cÖkwgZ Ki‡Z e¨eüZ nq| cvK¯’jxi GwmW g~jZ nvB‡Wªv‡K¬vwiK GwmW hv wgé Ae g¨vM‡bwkqvi mv‡_ wewµqv K‡i g¨vM‡bwkqvg †K¬vivBW I cvwb •Zwi K‡i| cvK¯’jxi Gwm‡Wi NbgvÎv 0.13 M n‡j wgé Ae g¨vM‡bwkqvi GKwU †meb gvÎvi 100mg g¨vM‡bwkqvg nvB‡Wªv·vBW KZ wjUvi cvK¯’wji GwmW‡K cÖkwgZ Ki‡e? g¨vM‡bwkqv‡gi cvigvYweK fi 24.3| [BUET. 2018-19] e¨vL¨v: Mg(OH)2+2HClMgCl2+2H2O n1e1 = n2e2 ev, w M e1 = V2S2e2 V2 = we1 MS2e2 = 100 103 2 58.3 0.13 1 = 2.638 102 L KUET 01. 250mL 2.0 M HNO3 cÖ¯‘Z Ki‡Z KZ MÖvg Mvp bvBwUªK GwmW jvM‡e? Gwm‡Wi MvpZ¡ n‡jv 70% HNO3| [KUET. 2018-19] A. 45.0g B. 31.5g C. 63.0g D. 126.5g E. 15.8g mwVK DËi: A. 45.0g e¨vL¨v: w = MSV 1000 = 63 2 250 1000 = 31.5 g cÖ‡qvRbxq HNO3 = 31.5 100 70 = 45 g 02. GKwU †Wªb †_‡K 1000 mL gqjv cvwb msMÖn K‡i Zvi COD wbY©‡qi Rb¨ DO cwigvc Ki‡Z wM‡q †`Lv †Mj 50 mL bgybv cvwbi Rb¨ 0.015 N Na2S2O3 `ªe‡Yi 10 mL †j‡M‡Q| H bgybv cvwb‡Z H2SO4 I K2Cr2O7 †hvM Kivi 3 NÈv ci cybivq DO wbY©q Ki‡Z wM‡q †`Lv †Mj Gi 50 mL cvwbi Rb¨ 0.015 N Na2S2O3 `ªe‡Yi 3.5 mL †j‡M‡Q| H bgybv cvwbi COD MYbv Ki| [KUET. 2018-19] A. 15.6 ppm B. 17.6 ppm C. 519.6 ppm D. 21.6 ppm E. 23.6 ppm mwVK DËi: A. 15.6 ppm e¨vL¨v: `yB †ÿ‡Î †hvMK…Z 0.015 N Na2S2O3 `ªe‡Yi AvqZ‡bi cv_©K¨ = (10 3.5) = 6.5 mL 1.0 mL 1.0 N Na2S2O3 `ªeY = 8 mg O2 6.5 mL 1.0 N Na2S2O3 `ªeY (8 6.5 0.015) mg O2 = 0.78 mg O2 bgybvwUi COD = 0.78 1000 50 = 15.6 ppm 03. †h cwigvY Kve©bWvBA·vBW 20g K¨vjwmqvg Kv‡e©v‡bU‡K DËß K‡i cvIqv †Mj Zv m¤ú~Y©iƒ‡c KwóK †mvWvi mv‡_ wewµqv K‡i †mvwWqvg Kv‡e©v‡b‡U cwiYZ Kiv n‡jv| wewµqv‡Z Kx cwigvY KwóK †mvWv cÖ‡qvRb nq? [KUET. 2018-19] A. 25 g B. 16 g C. 12 g D. 30 g E. 20 g mwVK DËi: B. 16 g e¨vL¨v: CaCO3 CaO + CO2 100 g 44 g Drcbœ CO2 Gi cwigvb = 44 20 100 = 8.8 g CO2 + 2NaOH Na2CO3 + H2O 44 2 40 = 80 g cÖ‡qvRbxq NaOH = 80 8.8 44 = 16 g 04. 500 ml AvqZ‡bi `ªe‡Y 50g H2SO4 `ªexf‚Z Av‡Q| D³ `ªe‡Yi 50ml cwigvY‡K 15% NaOH `ªeY Øviv cÖkwgZ Ki‡Z KZUzKz NaOH cÖ‡qvRb n‡e? [KUET. 2015-16, BUTex. 2016-17] A. 27.2ml B. 30.5ml C. 50.0ml D. 19.6ml E.2.72 ml mwVK DËi: A.27.2ml e¨vL¨v: H2SO4 + 2NaOH 2H20 + Na2SO4 15% NaOH Gi NbgvÎv S2 = 1510 40 = 3.75 M 50g H2SO4 Gi NbgvÎv 500 ml †Z S1 = 501000 98500 = 1.02 M V1S1e1 = V2S2e2 V2 = V1S1e1 S2e2 = 501.022 3.75 = 27.2ml 05. KMnO4 wb‡Pi mgxKiY Abyhvqx A·vwjK Gwm‡Wi mv‡_ wewµqv K‡i2KMnO4 – + 5C2O4 2– + 16H+2Mn2+ + 10CO2 + 8H2O GLv‡b, 20ml 0.1M KMnO4 wewµqv Ki‡e Ñ [KUET. 2015-16] A. 20ml 0.5M H2C2O4 mv‡_ B. 50ml 0.1M H2C2O4 Gi mv‡_ C. 50ml 0.5M H2C2O4 Gi mv‡_ D. 20ml 0.1M H2C2O4 Gi mv‡_ E. 20ml 0.2M H2C2O4 Gi mv‡_ mwVK DËi: B. 50ml 0.1M H2C2O4 Gi mv‡_ e¨vL¨v: 1000 ml 2M KMnO4 1000 ml 5M H2C2O4 20ml 0.1M KMnO4 50ml 0.1M H2C2O4 06. 50mL N/10H2SO4; 30mL N/3 HNO3 Ges 10mL N/2 HCl `ªeY wgwkªZ K‡i †gvU AvqZb 1.0L Kiv n‡jv| `ªeYwUi bigvwjwU KZ n‡e? [KUET-2016-17] A. N/20 B. N/40 C. N/50 D. 14N/15 E. N mwVK DËi: C. N/50 e¨vL¨v: N1V1+N2V2+N3V3= 1000×x 50× 10 1 +30× 3 1 + 10 × 2 1 = 1000 × x x = 50 1 07. 100dm3 0.3M HCl Ges 200dm3 0.6M H2SO4 †K GK‡Î wgwkªZ Kiv n‡jv| `ªeYwUi †gvjvwiwU KZ? [KUET. 2014-15] A. 0.45M B. 0. 6M C. 0.9M D. 0.25M E. 0.4M mwVK DËi: C. 0.9M e¨vL¨v: V1S1e1 + V2S2e2 = VSe; 100 0.3 1 + 200 0.6 2 = 300 M 1 M = 0.9M KviY `ywU wfbœ GwmW wgwkªZ Kivq GK ¶viKxq Gwm‡Wi mv‡c‡¶ †gvjvwiwU †ei Kiv n‡q‡Q|

418 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES V1 = ? S1 = 0.5 V2 = 100 S2=0.1 CUET 01. 500mL 0.1M NbgvÎvi Rjxq `ªeY ‡_‡K Zvc cÖ‡qv‡M KZ mL cvwb cvwZZ Ki‡j `ªe‡Yi NbgvÎv 0.4M n‡e? [CUET. 2015-16] A. 100 B. 125 C. 250 D. 375 E. 400 mwVK DËi: D. 375 e¨vL¨v: S1V1 =S2V2 V2 = 0.1500 0.4 = 125mL cvwZZ cvwbi cwigvY = (500 – 125ml) = 375mL 02. 100 wm.wm. nvB‡Wªv‡K¬vwiK Gwm‡W 2.5 MÖvg Pzbvcv_‡ii `ªeY‡K 100 wm.wm. †mwg- †gvjvi KwóK †mvWv `ªeY Øviv cÖkwgZ Kiv hvq| nvB‡Wªv‡K¬vwiK Gwm‡Wi NbgvÎv wbY©q Ki| [CUET. 2005-06] e¨vL¨v: awi, HCl Gi NbgvÎv x x 100 1000 1 = 2.5 100 2 + 100 1000 0.5 1 x = 1 M (Ans.) BUTex 01. 250 mL 0.5M HCI `ªeY e¨envi K‡i 100mL 0.1M HCl `ªeY cÖ¯‘Z Ki‡Z cÖ‡qvRbxq cvwbi cwigvY KZ? [BUTex-2016-17, Kz.‡ev. 2017] A. 20 mL B. 80 mL C. 100 mL D. 250 mL mwVK DËi: B. 80 mL e¨vL¨v: V1S1 = V2S2 = V1 × 0.5 = V2×0.1 V1= 20 cÖ‡qvRbxq cvwbi cwigvY = 100-20 = 80 mL 02. 50cm3 0.15M `ªeY‡K Gi †Wwm‡gvjvi `ªe‡Y iæcvšÍwiZ Ki‡Z KZ cm3 cvwb †hvM Ki‡Z n‡e? [BUTex. 2015-16] A. 75 B. 50 C. 25 D. 10 mwVK DËi: C. 25 e¨vL¨v: We know, S1V1=S2V2 0.15×50=0.1×V2 V2=75cm3 cvwb †hvM Ki‡Z n‡e =(75-50)cm3 = 25cm3 03. 200ml NaOH `ªeY‡K c~Y© cÖkwgZ Ki‡Z 200ml 0.1M A·vwjK GwmW `ªeY cÖ‡qvRb n‡j NaOH `ªe‡Y `ªexf~Z NaOH Gi cwigvY KZ? [BUTex. 2014-15] A. 0.4g B. 0.8g C. 1.6 g D. 3.2 g mwVK DËi: C. 1.6 g e¨vL¨v: 1 m 1.6 40 m e 0.200 0.1 2 M m VSe 04. GK †gvj cvig¨v½v‡bU Avqb A¤øxq RviK `ªe‡Y wewµqv K‡i Mn2 Avq‡b cwiYZ n‡Z KZ B‡jKUªb MÖnY K‡i? [BUTex.2013-14] A. 5 B. 23 6.0210 C. 6.02 10 / 5 23 D. 23 56.0210 mwVK DËi: D. 23 56.0210 e¨vL¨v: 2 MnO4 5e Mn 23 1mol electron 6.0210 wU 23 5mol electron 56.0210 wU| STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. NaOH Gi 700 cc bigvj `ªe‡Y KZ MÖvg Kw÷K †mvWv _v‡K? [MAT: 2012-2013] A. 14 B. 360 C. 7 D. 28 mwVK DËi: D. 28 e¨vL¨v: †UKwbK Abymv‡i, vs M m ev m = MVS = 40 700 10-3 1 = 28 02. 32 gm Aw·‡R‡b AYyi msL¨v- [MAT: 2012-2013] A. 6.844×1022 B. 2×105 C. 6.023×1023 D. 2.99×1023 mwVK DËi: C. 6.023×1023 e¨vL¨v: 32 gm Aw·‡Rb ej‡Z 1 ‡gvj‡K eySvq| 1 †gv‡j 6.023×1023 msL¨K AYy _v‡K| 03. 5g †divm mvj‡dU‡K m¤ú~Y©iƒ‡c RvwiZ Ki‡Z wb‡gœi KZ MÖvg KMnO4 cÖ‡qvRb n‡e? [MAT: 2010-2011] A. 1.04 B. 2.04 C. 4.02 D. 4.01 mwVK DËi: A. 1.04 e¨vL¨v: FeSO4 = KMnO4 ev, m1 M1 e1 = m2 M2 e2 ev, 5 152 1 = m2 158 5 m2 =1.04 g RviY-weRviY ‡_‡K 6 UvBc cÖkœ Av‡m- 01. RviY-weRvi‡Yi gZev` 02. RviK-weRvi‡Ki D`vniY 03. Redox wKbv hvPvB 04.RviY msL¨v wbY©q 05.wewfbœ gva¨‡g RviY msL¨vi cwieZ©b 06. RviY msL¨vi msL¨vi cwieZ©b †_‡K B‡jKUªb msL¨v wbY©q| CONCEPT 11 RviY-weRvi‡Yi wewfbœ gZvgZ Item–01: RviY-weRvi‡Yi gZev`: RviY-weRvi‡Yi mbvZb ev cÖvPxb gZev`: Rvi‡Yi mbvZb gZev` msÁv D`vniY ‡h c`v‡_©i RviY N‡U 01| Aw·‡R‡bi ms‡hvM C + O2 CO2 Kve©‡bi RviY 02| B‡jK‡Uªv‡b‡MwUf ‡g․‡ji ms‡hvM 2Fe 3Cl 2 2FeCl 3 Avqi‡bi RviY 03| B‡jK‡UªvcwRwUf †g․‡ji AcmviY 2Cu2O + O2 4CuO Cu2O -Gi RviY 04| nvB‡Wªv‡R‡bi AcmviY H2S + Cl2= 2HCl + S H2S-Gi RviY 05| †hvR¨Zv e„w× 2FeCl2 + Cl2= 2FeCl3 (Fe Gi †hvRbx 2 †_‡K 3 nq) cvU©-02 RviY-weRviY wfwËK MYbv

CHEMISTRY PLUS cwigvYMZ imvqb 419 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES weRvi‡Yi mbvZb gZev` msÁv D`vniY ‡h c`v‡_©i weRviY N‡U 01| Aw·‡R‡bi AcmviY CuO H2O Cu H2O CuO -Gi weRviY 02| B‡jK‡Uªv‡b‡MwUf ‡g․‡ji AcmviY 2FeCl3 + H2 2FeCl2 + HCl FeCl 3 -Gi weRviY 03| B‡jK‡UªvcwRwUf †g․‡ji ms‡hvM HgCl 2 Hg Hg 2Cl 2 HgCl 2 - Gi weRviY 04| nvB‡Wªv‡R‡bi ms‡hvM H Cl 2HCl 2 2 Cl 2 - Gi weRviY 05| †hvR¨Zv n«vmt 2FeCl3 + H2 2FeCl2 + HCl (Fe Gi †hvRbx 3 n‡Z 2 G n«vm cvq) RviY-weRvi‡Yi B‡jKUªbxq / AvaywbK gZev` : RviYt 1| e Gi AcmviY 2| abvZ¥K PvR© 3| FYvZ¥K PvR© 4| RviY msL¨v e„w× 5| 2Na – 2e 2Na+ weRviYt 1| e Gi ms‡hvRb 2| abvZ¥K PvR© 3| FYvZ¥K PvR© 4| RviY msL¨v n«vm 5| 2Cl2 + 2e 2Cl– mn‡R g‡b ivLvi c×wZ : RviY gv‡b hv e – A_©vr e – Z¨vM Kivi wewµqv| e Lvivc wRwbm ZvB e Z¨vM Ki‡j fv‡jv n‡q hvq gv‡b RviY msL¨v ev‡o| weRviK (Reducing Agent) n‡jv B‡jKUªb `vZKt weRviK hv K‡i- weRviK B‡jKUªb `vb RviY msL¨v e„w× A‡b¨i weRviY wb‡R RvwiZ RviK (Oxidizing Agent) n‡jv B‡jKUªb MÖvnKt RviK hv K‡i- RviK B‡jKUªb MÖnY RviY msL¨v n«vm A‡b¨i RviY wb‡R weRvwiZ Aw·‡eUv (O2)hy³ nq, nvB‡Wªv (H2)†eUv m‡i B‡jK‡Uªv cwRwUf (+ve) m‡i, B‡jK‡Uªv ‡b‡MwUf (-ve)R‡i RviY msL¨v ev‡o, hw` B‡jKUªb Qv‡o RviY-weRvi‡Yi g‡b ivLvi gZev`( †nv‡mBb gZev`) : hvi RviY msL¨v evo‡e ‡m weRviK Ges cÖwµqvwU RviY| (i) weRviK (RviY) Sn2+ + Hg2+ Sn4+ + Ho g GLv‡b wU‡bi RviY gvb +2 †_‡K +4 n‡q‡Q| A_©vr †e‡o‡Q| ZvB Sn2+ weRviK Ges Zvi RviY n‡q‡Q| (ii) weRviK (RviY) 2 3 NH3 + 3C +2 uO o N2 + 3Cu + 3H2O GLv‡b bvB‡Uªv‡R‡bi RviY gvb –3 †_‡K 0 n‡q‡Q| A_©vr †e‡o‡Q| ZvB NH3 weRviK Ges Zvi RviY n‡q‡Q| Rvi‡Yi wecixZ n‡”Q weRviY| Kv‡RB Confusion Gov‡Z ïay RviY g‡b ivL‡e| weRvi‡Ki D`vnib g‡b ivLvi wbqg i) avZz mg~n [s eøK -(ÿviavZz I g„rÿvi avZ)z] e¨wZµg- nvB‡Wªv‡Rb, Kve©b (AavZz nIqv ¯^‡Ë¡I weRviK) ii) wb¤œZi RviY msL¨v ev Avm †h․M mg~n [SnCl2 , (Sn2+), Fe2+, Cu+ ] ; wb¤œZi Aw·GwmW I Zv‡`i jeY mg~n I _vqv‡bU D”PvwiZ †h․Mmg~n iii) AmvaviY m~Î : avZz AavZz m~Ît avZzi msL¨v AavZzi ‡P‡q †ekx A_ev mgvb n‡j weRviK nq| A_v©r weRviK = avZz AavZz[mZK©t mgq C I H †K avZz ai‡Z n‡e] †hgb- KMnO4 †h․‡M avZz = 2, AavZz = 4 A_©vr avZz AavZz| ZvB RviK| Abyiƒcfv‡e, K2Cr2O7 RviK| Avevi, NaBH4 (avZz = 5, AavZz = 1) A_©vr avZz AavZz ; NaBH4ZvB weRviK Gevi †`wL Na2C2O4 RviK/bvwK weRviK ? GLv‡b (avZz 2 + 2 = 4, AavZz = 4) avZz I AavZzi msL¨v mgvb| m~Îvbymv‡i, Na2C2O4weRviK| m~Îvbymv‡i, wb‡¤œi †h․Mmg~n weRviK- CO, H2S , NH3, KI , HI, , LiAlH4, NaBH4, Gevi ej †`wL, H2C2O4 RviK/bvwK weRviK ? g‡b ‡iL , weRviK wPb‡j RviK wPb‡Z nqbv...........................ïay wecixZ wPšÍv Ki‡jB nq | cÖPwjZ weRviK c`v_© g‡b ivLvi Q›` nvq nvq Kzwgjøvi wRwbqvm mv‡ne A·‡dvW© H2 nvBWªvwRb (N2H4) C, Cu, (Cu2+ Not) Zn+H2SO4 SO2 , mKj avZz A·vwjK GwmW, Avm †h․M ‡_‡K wU‡bi cvZjv cU wb‡qB wdi‡jv _v‡qvmvj‡dU(Na2S2O3) _v‡qv‡bU D”PvwiZ SnCl2 cviA·vBW(H2O2) cUvwkqvg (K) (NaBH4) FeSO4

420 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES cÖPwjZ RviK-weRviK c`v_© g‡b ivLvi Q›`t I mv_x wdi‡e bv nvq ! hw` RviK-weRviK DfqB R¡vjvq RviK + weRviK I O3 mv_x SO2 wdi‡e FeSO4 bv NO nvq H2O2, HNO2 Item–02: RviY-weRviY wewµqv (Redox wKbv hvQvB)†Pbvi Dcvqt †KejgvÎ RviY msL¨vi cwieZ©b n‡jB wewµqvwU RviY-weRviY nq| RviY msL¨vi cwieZ©b bv n‡j wewµqvwU RviY-weRviY bq| mvaviYZ AwaKvsk wewµqvB RviY-weRviY wewµqv| +1 NaCl + +1 AgNO3 +1 NaNO3 + +1 AgCl wewµqvwU RviY-weRviY bq| KviY †mvwWqv‡gi RviY gvb wewµq‡K +1 wQj Drcv‡` +1 B Av‡Q A_©vr RviY msL¨vi cwieZ©b nqwb| Item–03: ‡¯úkvj wiW· wewµqv †Pbvi Dcvqt ¯^ZtRviY-weRviY wewµqv (Auto-Redox Recation): †Kv‡bv †g․‡ji cigvYy RvwiZ nq Ges GKB mv‡_ H GKB AYyw¯
Z Aci †g․‡ji cigvYy weRvwiZ nq, ZLb †m wiW· wewµqv‡K ¯^ZtRviY-weRviY wewµqv e‡j| †hgb2K +5 –2 NO3 Zvc 2K +3 NO3 + o N2 ; 2Pb( +5–2 NO3)2 2PbO + 4 +4 NO2 + o O2 AmvgÄm¨Zv wewµqv (Disproportionation Reaction) : KÿZvcgvÎv Ges DËß I Mvp NaOH `ªe‡Yi mv‡_ Cl2 Gi wewµqvq NaCl I NaClO3/ NaClO †h․M Drcbœ n‡q _v‡K| (i) 3 o Cl2 + 6NaOH 700C 5Na --1 Cl + Na +5 ClO3 + 3H2O; (ii) 3 o Cl2 + 6NaOH 250C Na --1 Cl + Na +1 ClO + 3H2O mvgÄm¨Zv wewµqv (Com-proportionation Reaction) : †h wiW· wewµqvq `yB wewµqK c`v‡_©i AYyi g‡a¨ _vKv wfbœ RviY Ae¯
vi GKwU wbw`©ó †g․‡ji Ggb GKwU Drcv` Drcbœ nq; hvi g‡a¨ Dfq wewµq‡Ki H wbw`©ó †g․jwU wiW· wewµqvi d‡j ga¨eZx© †Kv‡bv GKwU RviY Ae¯
v jvf K‡i, †m wiW· wewµqv‡K mvgÄm¨Zv wewµqv e‡j| (i) 2H2 +2 S + -4 SO2 2H2O + 3 o S (ii) Z`ªƒc, HCl wgwkÖZ KBrO3 I KBr Gi g‡a¨ wewµqvq Br2 I KCl Drcbœ nq| K +5 BrO3 + 5K -1 Br + 6HCl 6HCl + 3 o Br2 + 3H2O weiÄb wewµqv (Bleaching Reaction) : hv RviY I weRviY wµqvi gva¨‡g Dw™¢¾ I cÖvwYR iwOb c`v_©‡K weeY© K‡i Zv‡`i‡K weiÄK ev Bleaching Agent e‡j| ‡hgb-cvwbi Dcw¯
wZ‡Z Cl2, SO2 I H2O2 weiÄKiƒ‡c wµqv K‡i| Cl2 mej weiÄK nIqvq †gvUv Auvk ev m~Zvi •Zwi †MwÄ I Kvc‡oi weøwPs Kv‡R Cl2 cvwb e¨eüZ nq| Aciw`‡K SO2 I H2O2 g„`y weiÄK| Dj, wmé I m~² m~Zvi e¯‧‡KI KvM‡Ri gÛ‡K weiÄb Kv‡R SO2 e¨eüZ nq| Cl2 Gi weiÄb wµqv SO2 Gi weiÄb wµqv Cl2 + H2O 2HCl + [O]; iwOb e¯‧ + [O] RvwiZ eY©nxb e¯‧ SO2 + 2H2O H2SO2 + 2[H]; iwOb e¯‧ + [H] weRvwiZ eY©nxb kw³kvjx weiÄK `ye©j weiÄK RviY wµqvi gva¨‡g weiÄb NUvq weRviY wµqvi gva¨‡g weiÄb NUvq gRvi K_v- eZ©gv‡b gwnjv‡`i weDwU cvj©v‡i gv_vi Kv‡jv Pzj‡K †mvbvwj Kivi Kv‡R e¨eüZ wµ‡g H2O2 wgwkÖZ _v‡K| Short Ans Question SAQWRITTEN SUGGESTION BAQ Broad Ans Question cÖkœ-01. †h e¯‧ Ab¨ e¯‧i weRviY NUvq, wKš‧ wb‡R RvwiZ nq Zv‡K ––– e‡j| [BUTex. 2003-04] DËi: weRviK (Reducing Agent )| cÖkœ-02. RviK n‡”Q B‡jKUªb –––– c`v_©| [BUTex. 2005-06] DËi: MÖvnx| cÖkœ-03. K2Cr2O7 GKwU ––––| [BUTex. 2006-07] DËi: RviK| cÖkœ-04. FeSO4, K2Cr2O7, SnCl2 I KMnO4 Gi g‡a¨ †KvbwU kw³kvjx weRviK? [BUTex. 2010-11] DËi: SnCl2 kw³kvjx weRviK| cÖkœ-05. wb‡¤œi c`v_© mg~n‡K RviK, wbiæ`K Ges weRviK wnmv‡e †kÖYx wef³ Ki: [BUTex. 2006-07] (i) P2O5 (ii) KMnO4 (iii) H2S (iv) CaO (v) NO2 Ges (vi) Na2S2O3.2H2O DËi: wbiæ`K P2O5, CaO ; RviK KMnO4.NO2 ; weRviK H2S, Na2S2O3.2H2O

CHEMISTRY PLUS cwigvYMZ imvqb 421 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES CaCO3 CaO+CO2 2+ 2+ RviYgvb cwieZ©b nqwb cÖkœ-06. 1.5g †jvnvi AvKwiK‡K jNy H2SO4 Gi `ªexf~Z K‡i `ªe‡Yi AvqZb 200 mL Kiv n‡jv| G `ªeY †_‡K 25 mL wb‡q UvB‡Uªkb Ki‡Z 0.02M NbgvÎvi 22.5 mL K2Cr2O7 `ªeY cÖ‡qvRb n‡jv| AvKwi‡K †jvnvi kZKiv cwigvY KZ? [BUTEX: 19-20] DËi: cÖkœvbymv‡i, K2Cr2O7 Gi †gvj msL¨v, nK2Cr2O7 = 0.02 22.5 10–3 mol = 4.5 10–4 mol FeSO4 Gi †gvj msL¨v, nFeSO4 = 6 nK2Cr2O7 = 6 4.5 10–4 = 2.7 10–3 mol mFe = 55.85 2.7 10–3 gm = 0.150795 gm 200 mL G Fe Av‡Q = 0.150795 200 25 g = 1.20636 g Fe Av‡Q = 1.20636 1.5 100% = 80.424% (Ans.) REAL TEST ANALYSIS OF PREVIOUS YEAR QUESTIONS STEP 01 ANALYSIS OF GENERAL UNIVERSITY QUESTION DU 01. wb‡Pi †KvbwU RviY-weRviY wewµqv bq? [DU-Ka.2017-18] A. 2Na+Cl2 2NaCl B. SnCl2+FeCl3SnCl4+FeCl2 C. Cu+HNO3Cu(NO3)2+NO+H2O D. NaCl+AgNO3NaNO3 +AgCl mwVK DËi: D. NaCl+AgNO3NaNO3 +AgCl e¨vL¨v: GLv‡b D option- G RviY gv‡bi †Kvb cwieZ©b nqwb| ZvB GwU RviY-weRviY wewµqv bq| 02. wb‡gœi wewµqvwUi ‡ÿ‡Î ‡KvbwU mZ¨? [DU-Ka. 2015-16, JU. 2016-17] SnCl2 + 2FeCl3 SnCl4 + 2FeCl2 A. Sn is oxidized B. Cl is oxidized C. Fe is oxidized D. Cl is reduced mwVK DËi: A. Sn is oxidized e¨vL¨v: Dc‡iv³ wewµqvq Sn RviY msL¨v ev‡o Sn2+ → Sn4+(+2 to +4) | A_©vr Sn weRviK ZvB RvwiZ nq / Sn is oxidized. 03. †Kvb wewµqvwU RviY-weRviY bq? [DU-Ka. 2014-15] A. 2H2O2 2H2O + O2 B. CO2 + C 2CO C. CaCO3 CaO+CO2 D. Fe2O3+3CO2Fe +3CO2 mwVK DËi: C. CaCO3 CaO+CO2 e¨vL¨v: GB wewµqvq K¨vjwmqv‡gi RviY gv‡bi †Kvb cwieZ©b nqwb A_v©r wewµqvi c~‡e© RviY gvb +2 Ges wewµqvi c‡iI RviYgvb +2| myZivs GwU RviYweRviY wewµqv bq| 04. wb‡gœi wewµqvq †KvbwU mZ¨? [DU.2013-2014, BSMRSTU. 2018-19] SnCl2+2FeCl3 SnCl4 + 2FeCl2 A. Sn RvwiZ n‡q‡Q B. Cl RvwiZ n‡q‡Q C. Fe RvwiZ n‡q‡Q D. Cl RvwiZ n‡q‡Q mwVK DËi: A. Sn RvwiZ n‡q‡Q e¨vL¨v: Dc‡iv³ wewµqvq Sn Gi RviY msL¨v ev‡o (+2 to +4) | A_©vr Sn weRviK ZvB RvwiZ nq | 05. †Kvb ivmvqwbK wewµqvq [Fe(CN)6] 3– hLb [Fe(CN)6] 4– G cwiewZ©Z nq ZLb- [DU.2001-2002] A. 1wU ‡cÖvUb nvivq B. 1 B‡jKUªb jvf K‡i C. 1wU B‡jKUªb nvivq D. 1wU †cªvUb jvf K‡i| mwVK DËi: B. 1 B‡jKUªb jvf K‡i e¨vL¨v: GLv‡b RviY msL¨v -3 ‡_‡K -4 nq A_v©r GKwU B‡jKUªb MÖnY K‡i ev jvf K‡i| 06. RviY ‣ewkó¨ †KvbwU? [DU.1999-2000] A. †g․j B‡jKUªb nvivq B. †g․‡ji †hvR¨Zv K‡g C. FbvZ¡K †h․Mg~jK K‡g D. FbvZ¡K †h․Mg~jK ev‡o mwVK DËi: A. †g․j B‡jKUªb nvivq e¨vL¨v: RviY gv‡b B‡jKUªb Qvob A_©vr †g․jwU B‡jKUªb nvivq| 07. wb‡Pi †KvbwU weRviK? [DU.1999-2000, Xv.‡ev. 2014] A.NaBH4 B. HNO3 C. KMnO4 D. CH3OH mwVK DËi: A. NaBH4 e¨vL¨v: KMnO4 = RviK, HNO3 = RviK, CH3OH = wKQzUv wbi‡cÿ, NaBH4 = weRviK 08. wb‡Pi †KvbwU RviK weRviK Dfq wn‡m‡e KvR K‡i bv? [DU.1996-1997] A. H2O2 B.K2Cr2O7 C. FeSO4 D. O3 mwVK DËi: B. K2Cr2O7 e¨vL¨v: RviK I weRviK Dfq wnmv‡e KvR K‡i- H2O2, O3, SO2 myZivs K2Cr2O7 DËi KviY Bnv RviK| ‡R‡b ivLv DwPZ FeSO4 weRviK [Avm †h․M]| JnU 01. RviK-Gi •ewkó¨ †KvbwU? [JnU. 2015-16] A. wb‡R RvwiZ nq B. wb‡R weRvwiZ nq C. weRviY NUvq D. B‡j±ªb nvivq mwVK DËi: B. wb‡R weRvwiZ nq JU 01. Na2S2O3+I2 Na2S4O6+NaI wewµqvq; i. I2 RviK ii. I2 Gi RviY N‡U‡Q iii. Na2S2O3 RviK| [JU-A3.2017-18] wb‡Pi †KvbwU mwVK? A. i B. ii I iii C. iii D. i I ii mwVK DËi: A. i e¨vL¨v: Na2 S2 +2 O3 + I2 0 Na2 S4 +2.5 O6 + Na I –1 GLv‡b Av‡qvwW‡bi RviY gvb 0 †_‡K –1 n‡q‡Q| A_©vr K‡g‡Q ZvB RviK| Na2S2O3 Gi RviY N‡U‡Q ZvB Na2S2O3 weRviK| 02. 2CuSO4 + 4KI Cu2I2+ 2K2SO4+I2 wewµqvq- [JU-A4.17-18] i. CuSO4 RviK I KI weRviK ii. K Gi RviY msL¨vi †Kvb cwieZ©b nq bv iii. 2wU B‡jKUª‡bi Av`vb cÖ`vb N‡U| A. i I ii B. i I iii C. ii I iii D. i, ii I iii mwVK DËi: D. i, ii I iii e¨vL¨v: 2C +2 uSO4 + 4K +1 I –1 Cu2 +2 I2 –2 + 2K2 +2 S +4 O4 –6 + I2 0 RviK weRviK GLv‡b, Kcv‡ii RviY gvb +2 †_‡K 1 n‡q‡Q| A_©vr CuSO4 RviK| Avevi, Av‡qvwW‡bi RviY gvb –1 †_‡K 0 n‡q‡Q| A_©vr KI weRviK|

422 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 03. SnCl2 + 2HgCl2 SnCl4 + Hg2Cl2 wewµqvwU‡Z i. Hg Gi RviY gv‡bi cwieZ©b- 2; ii. Hg Gi RviY gv‡bi cwieZ©b- 1; iii.Cl Gi RviY gv‡bi cwieZ©b- 0| †KvbwU mwVK? [JU-6.2017-18] A. i I ii B. i I iii C. ii I iii D. i,ii I iii mwVK DËi: C. ii I iii e¨vL¨v: 2 2 2 2 4 4 2 4 2 2 2 2 2 2 SnCl Hg Cl SnCl Hg Cl Hg- Gi RviY gvb +2 †_‡K +1 n‡q‡Q| Cl- Gi RviY gv‡bi †Kvb cwieZ©b nq wb| 04. ClO3 - +I- +H2SO4 = Cl- +HSO4 - wewµqvwU‡Z i. S Gi RviY gv‡bi cwieZ©b +6 ii.ClO3 - Gi weRviY N‡U iii. ClO3 - weRviK wn‡m‡e KvR K‡i| †KvbwU mwVK? [JU-A9.17-18] A. i I ii B. i I iii C. ii I iii D. i,ii I iii mwVK DËi: Blank e¨vL¨v: 6 4 6 1 2 4 5 3 ClO I H SO Cl H SO S- Gi RviY gv‡bi †Kvb cwieZ©b nqwb| Cl Gi RviY msL¨v +5 †_‡K n«vm †c‡q -1 n‡q‡Q| ZvB Cl Gi weRviY N‡U‡Q| Kv‡RB ClO3 - GKwU RviK| 05. 2KMnO4+8H2SO4+10FeSO4=K2SO4+2MnSO4 +5Fe2(SO4)3+8H2O wewµqvq- i. Mn7+ RviK ii. Fe2+ weRviK iii. SO4 2- `k©K Avqb; †KvbwU mwVK? [JU-A13.2017-18] A. i I ii B. i I iii C. ii I iii D. i,ii I iii mwVK DËi: D. i,ii I iii e¨vL¨v: 4 2 4 2 4 7 2K M nO 8H SO 10FeSO Fe SO Mn SO4 K2SO4 H2O 2 4 3 3 5 2 2 8 Mn- Gi RviY gvb +7 †_‡K +2 n‡q‡Q| Mn7+ Gi weRviY N‡U‡Q e‡j Mn7+ RviK| Fe- Gi RviY gvb +2 †_‡K +3 n‡q‡Q| Fe2+ Gi RviY N‡U‡Q e‡j Fe2+ weRviK| SO4 2- Gi †Kvb cwieZ©b nqwb e‡j GwU `k©K Avqb| 06. H2O2 G O Gi RviY msL¨v KZ? [JU-D: 2014-15, KU. 2013-14] A. –1 B. –2 C. –3 D. –4 mwVK DËi: A. –1 e¨vL¨v: 2 + 2x = 0, ev, x = –1 07. 2KMnO4 + 5H2O2 + H+ ⇌ 2Mn2+ + 2K+ + 5O2 + 8H2O Dc‡ii wewµqvq weRviK n‡”Q [JU:13-14] A. KMnO4 B. H2O2 C. H2 D. H+ mwVK DËi: B. H2O2 e¨vL¨v: GLv‡b g¨v½vwb‡Ri RviY msL¨v n«vm †c‡q‡Q ZvB RviK wecixZ bxwZ Abymv‡i H2O2 weRviK| 08. 2K + F2 2KF, wewµqvwU‡Z RviK †KvbwU? [JU.2011-2012] A. K B. F2 C. K+ D. F - mwVK DËi: B. F2 e¨vL¨v: 2K0 + F2 0 2K+ F – GLv‡b cUvwkqv‡gi RviY gvb †e‡o‡Q| ZvB weRviK Ges †d¬vwi‡bi RviY msL¨v K‡g‡Q e‡j RviK| 09. 2K + F2 2KF, wewµqvwU‡Z weRviK †KvbwU? [JU. 2011-2012] A. K B. F2 C.K+ D. FmwVK DËi: A. K e¨vL¨v: Dc‡ii e¨vL¨vwU †`L| 10. weRviY wewµqvq †g․‡ji - [ JU.2010-2011] A. abvZ¥K RviY msL¨v e„w× cvq B. FYvZ¥K RviY msL¨v e„w× cvq C. FYvZ¥K RviY msL¨v n«vm cvq D. ‡KvbwUB bq| mwVK DËi: B. FYvZ¥K RviY msL¨v e„w× cvq 11. wb‡gœi †KvbwU RviK c`v_©? [JU.2009-2010] A. Cl2 B. HBr C. FeCl2 D. H2S mwVK DËi: A. Cl2 e¨vL¨v: RviK c`v_© n‡jv mKj AavZz, n¨v‡jv‡Rb (F2, Cl2, Br2, I2), O3, O2, KMnO4, K2Cr2O7, cvi A·vBW, cvi-Aw·GwmW I Zv‡`i jeY (KCl, KNO3), WvBA·vBW (MnO2, PbO2) Ges BK †h․M mg~n| 12. hLb 2Na(s)+Cl2(g) 2NaCl(s) wewµqvwU msNwUZ nq ZLb Na- [JU.2009-2010, IU. 2014-15] A. B‡jKUªb MÖnY K‡i B. B‡jKUªb Z¨vM K‡i C. ‡cÖvUb MÖnb K‡i D. ‡cÖvUb Z¨vM K‡i mwVK DËi: B. B‡jKUªb Z¨vM K‡i e¨vL¨v: 2Na – 2e = 2Na+ 2Cl + 2e = 2Cl– 2Na+Cl2 = 2NaCl 13. hLb, 2Li(s) + Cl2(g) 2LiCl(s) wewµqvwU msNwUZ nq ZLb Cl2(g)- [JU.2009-2010] A.B‡jKUªb MÖnY K‡i B. B‡jKUªb Z¨vM K‡i C. ‡cÖvUb MÖnY K‡i D. ‡cÖvUb Z¨vM K‡i mwVK DËi: A. B‡jKUªb MÖnY K‡i e¨vL¨v: 2Li – 2e = 2Li+ Cl2 + 2e = 2Cl– 2Li +Cl2 = 2LiCl RU 01. KMnO4 + H2SO3 MnSO4 + K2SO4 + H2SO4 – GB wewµqvq †Kvb AYyi †Kvb cigvYy weRviK? [RU-H2.2017-18] A. KMnO4 Gi Mn B. H2O Gi O C. H2SO3 Gi S D. MnSO4 Gi S mwVK DËi: C. H2SO3 Gi S e¨vL¨v: H2SO3 G S Gi RviY gvb +4 H2SO4 G S Gi RviY gvb +6 H2SO3 G S cigvYy RvwiZ n‡q‡Q| ZvB H2SO3 Gi S cigvYywU weRviK CU 01. †KvbwU RviY-weRviY wewµqv bq? [CU-A.2017-18] A. 2Cu(NO3)2 2CuO+ 4NO2+ O2 B. 2Na + Cl2 2NaCl C. Na2SO3 + 2HCl 2NaCl + SO2 + H2O D. Mg + H2SO4 MgSO4 + H2 mwVK DËi: C. Na2SO3 + 2HCl 2NaCl + SO2 + H2O e¨vL¨v: Na2SO3 + 2HCl 2NaCl + SO2 + H2O (cÖkgb wewµqv) 02. wb‡Pi †KvbwU ZxeªZg RviK c`v_©? [ CU.2010-2011, KU. 2012-13, JU. 2016-17] A. ‡d¬vwib B. ‡K¬vwib C. ‡eªvwgb D.Av‡qvwWb E. bvB‡Uªv‡Rb mwVK DËi: A. ‡d¬vwib e¨vL¨v: †d¬vwib me‡P‡q Zwor FYvZ¥K (Electronegativity 4.0)| ZvB GwU Zxeª RviK| 03. RviY, weRviY I weiÄb ÿgZv Av‡Q Ggb GKwU M¨vm nj- [CU.2008-09] A. H2S B. Cl2 C. SO2 D. O2 E.N2 mwVK DËi: C. SO2 e¨vL¨v: H2S weRviK/Aat†ÿcb weKviK Cl2 RviK, O2 RviK, N2 A¨v‡RvU SO2 RviK, weRviK I weiÄK

CHEMISTRY PLUS cwigvYMZ imvqb 423 ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 04. Rvi‡bi †KvbwU N‡Ubv? [CU.2002-2003] A. O2 ms‡hvM B. H2 Acmvib C. †hvR¨Zv e„w× D. †hvR¨Zv n«vm mwVK DËi: D. †hvR¨Zv n«vm e¨vL¨v: Rvi‡bi cyivZb gZev`| IU 01. †Kvb&wU RviY-weRviY wewµqv? [IU. 2019-20] A. CaCO3 CaO + CO2 B. 2H2S + SO2 2H2O+3S C. HF +KOH KF+H2O D. NaCl + AgNO3 NaNO3 + AgCl mwVK DËi: B. 2H2S + SO2 2H2O+3S e¨vL¨v: 2H2S + SO2 2H2O + 3S 2 +4 RviY weRviY 02. Na2S2O3+I2Na2S4O6+Nal; GB wewµqvi RviK- [IU-D. 2016-17] A. I2 B. Na2S2O3 C. I– D. me¸‡jv mwVK DËi: A. I2 e¨vL¨v: Na2 S2O3 + I2 Na2S4O6 +NaI I 0 2 2I –1 , RviY msL¨v n«vm cvq, ZvB, I2 RviK| BRU 01. wb‡Pi †KvbwU weRviK? [BRU-D1.2017-18] A. NaBH4 B. HNO3 C. KMnO4 D. CH3OH mwVK DËi: A. NaBH4 e¨vL¨v: NaBH4, LiAlH4, LiBH4 BZ¨vw` weRviK c`v‡_©i D`vniY| 02. Sn †Kvb RviY Ae¯’vq weRviK wnmv‡e KvR K‡i? [BRU-D1.2017-18, e.‡ev. 2016] A. +4 B. -4 C. +2 D. -2 mwVK DËi: C. +2 e¨vL¨v: Sn2+ weRviK Ges Sn4+ RviK wn‡m‡e KvR K‡i| CoU 01. kw³kvjx weRviK c`v_© n‡jvÑ [CoU–A. 2019-20] A. K B. Mg C. Al D. Ba mwVK DËi: A. K 02. GLv‡b †KvbwUi weRviY N‡U‡Q? [CoU–B. 2019-20] A. IO3 B. I – C. H + D. †Kv‡bvwUB bq mwVK DËi: D. †Kv‡bvwUB bq e¨vL¨v: cÖkœ Am¤ú~Y© STEP 02 ANALYSIS OF SCIENCE & TECHNOLOGY QUESTION SUST 01. wb‡Pi wewµqvwU‡Z †KvbwU RviK Ges †KvbwU weRviK? Co(s) + Cl2(g)CoCl2(s) [SUST.2007-08] A. Co RviK, Cl2 weRviK B. Co weRviK, Cl2 RviK C. Co Ges Cl2 Df‡qB RviK D.Co Ges Cl2 Df‡qB weRviK mwVK DËi: B. Co weRviK, Cl2 RviK e¨vL¨v: GLv‡b wewµqvwU‡Z wewµqK Co Ges Cl2 Gi RviY msL¨v 0| Drcv`‡K Co Gi RviY msL¨v + 2 Ges Cl2 Gi RviY msL¨v –2. GLv‡b ¯úóZt Co weRviK Ges Cl2 RviK| JUST 01. wb‡Pi †KvbwU RviK Ges weRviK Dfq wnmv‡e wµqv K‡i? [JUST-A,Set-Kha 2018-19;] A. HNO3 B. KMnO4 C. H2S D. SO2 mwVK DËi: D. SO2 e¨vL¨v: GKB mv‡_ RviK I weRviK Dfqiƒ‡c wµqv K‡i NO, HNO2, SO2, H2O2, O3 MBSTU 01. wb‡Pi †Kvb †h․MwU weRviK? [MBSTU-A. 2019-20] A. KMnO4 B. K2Cr2O7 C. FeCl3 D. SnCl2 mwVK DËi: D. SnCl2 e¨vL¨v: Avm ev wb¤œZi RviY msL¨v wewkó †h․M memgqB weRviK| BSMRSTU 01. wb‡Pi †KvbwU RviK bq? [BSMRSTU-C. 2019-20] A. LiAlH4 B. KMnO4 C. K2Cr2O7 D. †KvbwUB bq mwVK DËi: A. LiAlH4 e¨vL¨v: LiAlH4 n‡jv weRviK| KviY weRviK e `vb K‡i| GLv‡b, 4H 4e 4H+ ; 4wU e Z¨vM K‡i| 02. wb‡Pi †h․M¸‡jvi g‡a¨ †KvbwU RviK I weRviK Dfq iƒ‡cB wµqv K‡i? [BSMRSTU-B.2017-18; 2016-17, Xv. †ev.17] A. NO B. KMnO4 C. CrO3 D. Al2O3 mwVK DËi: A. NO e¨vL¨v: NO, Fe2+ , O3, SO2, HNO2, H2O2 c`v_© mg~n RviK I weRviK wn‡m‡e KvR K‡i| PUST 01. Fe2+ wK iƒ‡c KvR K‡i? [PUST-A.2017-18, HSTU. 2014-15] A. GKwU RviK wn‡m‡e B. GKwU weRviK wn‡m‡e C. RviK I weRviK Dfq wn‡m‡e D. †KvbwUB bq mwVK DËi: C. RviK I weRviK Dfq wn‡m‡e e¨vL¨v: RviK wn‡m‡e : Fe2+ + 2e- Fe weRviK wn‡m‡e : Fe2+ Fe3+ + e02. wb‡¤œi †KvbwU RviK c`v_©? [PUST-A.2017-18] A. FeSO4 B. SnCl2 C. GeCl2 D. l2 mwVK DËi: D. l2 e¨vL¨v: KMnO4, K2Cr2O4, Fe3+, Cu2+, Cl2, F2, Br2, I2 BZ¨vw` RviK c`v‡_©i D`vniY| 03. wb‡¤œi †KvbwU RviK I weRviK Dfq wn‡m‡e KvR K‡i? [PUST.17-18; MBSTU-C,Set-2:2018-19 Xv. †ev. 16] A. H2O2 B. Kl C. Cl2 D. KMnO4 mwVK DËi: A. H2O2 e¨vL¨v: Fe2+, H2O2, NO, Cu+ , Sn2+ BZ¨vw` RviK I weRviK Dfq wn‡m‡e KvR K‡i| 04. wb‡¤œi A·vBW¸‡jvi †KvbwU weRviK c`v_© wn‡m‡e KvR Ki‡Z cv‡i bv? [PUST-B.2017-18] A. NO2 B. SO2 C. ClO2 D. CO2 mwVK DËi: D. CO2 e¨vL¨v: CO2 G C-Gi RviY msL¨v +4 hv C Gi m‡e©v”P RviY gvb| Kv‡RB CO2 ïaygvÎ RviK c`v_© wn‡m‡e KvR K‡i| 05. CuSO4 + Kl Cu2l2 + l2 + K2SO4 wewµqvq †KvbwU `k©K Avqb? [PUST-B.2017-18] A. Cu2+ B. SO4 2- C. I- D. Cu+ mwVK DËi: B. SO4 2- e¨vL¨v: 2CuSO4 + 4KI Cu2I2 + I2 + 2K2SO4 -G SO4 2- Avq‡bi RviY gv‡bi †Kvb cwieZ©b nq bv e‡j GwU `k©K Avqb wn‡m‡e|

424 cwigvYMZ imvqb CHEMISTRY PLUS ASPECT SERIES cvV¨eB‡K mnR Kivi cÖqvm ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES ASPECT SERIES 06. NO wK iƒ‡c KvR K‡i? [PUST-A.2017-18] A. RviK B. weRviK C. RviK I weRviK DfqB D. ‡KvbwUB bq mwVK DËi: C. RviK I weRviK DfqB e¨vL¨v: NO eY©nxb cÖkg A·vBW, cvwb‡Z mvgvb¨ cwigv‡b `ªeYxq Ges GwU RviK I weRviK Dfqiƒ‡c wµqv K‡i| 07. H2O2 + SO2 H2SO4 wewµqvwU‡Z Ñ [PBSTU-A1/A2.2016-17] A. H2O2 RviK SO2 weRviK B. SO2 RviK H2O2 weRviK C. H2O2 A¤ø SO2 ÿvi D. SO2 A¤ø H2O2 ÿvi mwVK DËi: A. H2O2 RviK SO2 weRviK HSTU 01. wb‡gœi †Kvb wewµqvq H2SO4 RviK wnmv‡e KvR K‡i? [HSTU-A.17-18] A. Zn+H2SO4ZnSO4+H2 B. ZnO+H2SO4ZnSO4+H2O C. Zn(OH)2+ H2SO4ZnSO4+2HO2 D. ZnCO3+H2SO4ZnSO4+H2O +CO2 mwVK DËi: A. Zn+H2SO4ZnSO4+H2 e¨vL¨v: 0 Zn + +2 H2SO4 +2 ZnSO4 + 0 H2 RviK c`v‡_©i weRviY N‡U| 02. wb‡Pi †Kvb wewµqvwU RviY-weRviY wewµqv bq? [HSTU-A.2016-17] A. Ba2+(aq.)+SO4 -2 (aq.) BaSO4(S) B. Br2(g) + 2I- (aq.) 2Br- (aq.) + I2(S) C. Cl2(g) + S-2 (aq.) S(s) + 2Cl- (aq.) D. Cu2+(aq.) + Zn(s) Cu(s) + Zn2+ (aq.) mwVK DËi: A. Ba2+(aq.)+SO4 -2 (aq.) BaSO4(S) e¨vL¨v: RviY wewµqvq RviY msL¨vi cwieZ©b NU‡e wKš‧ AckbwU‡Z RviY msL¨vi †Kvb cwieZ©b N‡U bvB ZvB mwVK DËi A. 03. wb‡Pi †KvbwU RviY-weRviY wewµqvi D`vniY? [HSTU-D.2016-17] A. CuO + H2SO4 CuSO4 +H2O B. H+ + OH- H2O C. 2SO2 + O2 2SO3 D. Ag+ + Cl- AgCl mwVK DËi: C. 2SO2 + O2 2SO3 e¨vL¨v: KviY ïaygvÎ C Option G RviY msL¨vi cwieZ©b n‡q‡Q| NSTU 01. 2S2O 2– 3 S4O 2– 6 + 2e– wewµqvwU mwVK †Kb? [NSTU-C. 2019-20] A. `yB †gvj wewµqK `ywU B‡jKUªb Z¨vM K‡i B. wewµqK I Drcv‡` mvjdv‡ii †hvRbx 4 Ges 2 C. wewµqK I Drcv‡` mvjdv‡ii me©‡gvU RviY msL¨vi cwieZ©‡bi nvi 2 D. wewµqK I Drcv‡` mvjdv‡ii RviY msL¨v 4 Ges 2 mwVK DËi: A. `yB †gvj wewµqK `ywU B‡jKUªb Z¨vM K‡i DU Technology 01. CuSO4(aq) + Zn(s) ZnSO4(aq) + Cu(s) wewµqvq †KvbwU RvwiZ nq? [DU-Projukti. 2019-20] A. CuSO4 B. Zn C. ZnSO4 D. CU mwVK DËi: B. Zn STEP 03 ANALYSIS OF ENGINEERING & BUTex QUESTION BUET 01. ‡jvnvq gwiPv cov GKwU? [BUET: 2012-2013] A. RviY wewµqv B. RviY-weRviY C. weRviY wewµqv D. cÖwZ¯
vcb wewµqv mwVK DËi: B. RviY-weRviY 02. bx‡Pi †KvbwU weRviK? [BUET: 2011-2012] A. FeCl3 B. KMnO4 C. I2 D. Na2S2O3 mwVK DËi: D. Na2S2O3 03. bx‡Pi †KvbwU weRviK? [BUET: 2010-2011] A. Fe2(SO4)3 B. K2Cr2O7 C. KI D. I2 mwVK DËi: C. KI 04. wb‡gœi wewµqvi †KvbwU RviK? [BUET:2007-2008] PbO2+Mn2++SO4 2-PbSO4+MnO4 - A. SO4 2- B. Mn2+ C. Pb D. PbO2 mwVK DËi: D. PbO2 e¨vL¨v: PbO2+Mn2++SO4 2-PbSO4+MnO4 - GLv‡b Pb Gi RviY gvb +4 †_‡K +2 n‡q‡Q| RviY gvb K‡g‡Q ZvB RviK| A_v©r K‡g‡Q ZvB RviK| 05. bx‡Pi wewµqvq RviK wPwýZ Ki| [KUET. 2016-17, BUET: 2006-2007] Fe2++2H+ +NO3 -Fe3++NO2+H2O A. Fe2+ B. H+ C. NO3 - D. H2O mwVK DËi: C. NO3 - e¨vL¨v: GLv‡b bvB‡Uªv‡R‡bi RviY gvb +5 †_‡K +4 n‡q‡Q| 06. wb‡gœi †KvbwU mwVK bq? [KUET. 2014-15] A. Fe – 3e– Fe3+ B. Fe3+ + 2e– Fe+ C. Al3+ - e – Al2+ D. Fe2+ - e – Fe3+ E. Zn2+ + 2e– Zn mwVK DËi: C. Al3+ - e – Al2+ e¨vL¨v: Al3+ - e – Al4+ 07. †Kvb †h․MwU RviK wn‡m‡e e¨eüZ nq? [CUET. 2015-16] A. MnO4 B. Cr2O3 C. CrO3 D. MnSO4 E. KCl mwVK DËi: C. CrO3 e¨vL¨v: CrO3 †h․‡M Cr Gi RviY gvb +6 hv Cr Gi m‡e©v”P RviY gvb| Gi d‡j Cr6+ Avi e – Qvo‡Z cv‡i bv eis ïay e – MÖnY Ki‡Z cvi‡e Ges Cr Gi RviY gvb ïayB Kg‡Z cvi‡e| d‡j CrO3 †hvM ïayB RviK Ges Zxeª RviK wn‡m‡e wµqv K‡i| e‡j ivLv fv‡jv, Cr2O3 †h․MwU RviK I weRviK Dfq wn‡m‡e wµqv Ki‡Z cv‡i e‡j †ekx MÖnb‡hvM¨ DËi CrO3 -B n‡e| 08. K2Cr2O7 ,KMnO4 , FeSO4, FeCl3 Gi g‡a¨ †KvbwU weRviK? [BUTex.2012-2013] A. K2Cr2O7 B. KMnO4 C. FeSO4 D. FeCl3 mwVK DËi: C. FeSO4 e¨vL¨v: Avm& †h․Mmg~n †hgb SnCl2 , FeSO4 weRviK| STEP 04 ANALYSIS OF MEDICAL & HSC QUESTION MAT 01. wb‡Pi †KvbwU „Gaseous oxidizing agent‟? [MAT. 2019-20] A. H2O2 B. KMnO4 C. H2SO4 D. O3 mwVK DËi: D. O3 e¨vL¨v: RviK c`v_© D`vniY M¨vmxq F2, Cl2, O2, O3, SO2, NO2 cÖf…wZ| Zij Br2, H2O2, HNO3, H2SO4 cÖf„wZ| KwVb I2, KMnO4, K2Cr2O7, KClO3, MnO2, FeCl3 cÖf…wZ| 02. wb‡Pi †KvbwU RviK I weRviK Dfq wnmv‡eB KvR K‡i? [MAT. 2019-20] A. Ammonia B. Nitrogen peroxide C. Nitric acid D. Nitrous acid mwVK DËi: D. Nitrous acid e¨vL¨v: †hme †h․M RviK I weRviK Dfq wnmv‡eB KvR K‡i: SO2, NO, CO, H2O2, HNO2 cÖf…wZ| RviY weRviY