Title 4. Che. Engg. Practice Sheet-(2nd Paper) Without Solve.pdf ✅

Zwor imvqb  Engineering Practice Sheet ........................................................................................................................ 1 WRITTEN weMZ mv‡j BUET-G Avmv cÖkœvejx 1. Fe2+(0.2 M)/Fe Ges Cu2+(0.1 M)/Cu Gi EMF KZ? [Fe2+/Fe = – 0.44 V, Cu2+/Cu = 0.34 V] [BUET 22-23] DËi: 0.7711 V 2. wjw_qvg Avqb e ̈vUvwi eZ©gvb mg‡qi Avkve ̈ÄK kw3 mÂq e ̈e ̄’v ̧‡jvi GKwU| e ̈vUvwii cÖgvY Zwo”PvjK e‡ji gvb 3.70 V| †mj wewμqvwU wb¤œiƒc: CoO2 + LiC6  LiCoO2 + 6C e ̈vUvwii Aa©-†Kvl wewμqv wjL| [BUET 21-22] DËi: RviY Aa©wewμqv: LiC6  Li+ + 6C + e– weRviY Aa©wewμqv: CoO2 + Li+ + e–  LiCoO2 3. hw` H2SO4 Gi jNy `ae‡Yi ga ̈ w`‡q Pt ZworØv‡ii gva ̈‡g GKwU Zwor we‡køl ̈ †Kv‡l 1 NÈv we`y ̈r cÖevwnZ nq, Zvn‡j STP-†Z 300 mL H2(g) Drcbœ nq| we`y ̈rcÖev‡ni cwigvY wbY©q Ki| [BUET 20-21] DËi: 0.72 A (cÖvq) 4. wb‡Pi †KvlwU e ̈env‡ii c~‡e© Gi g‡a ̈ 250 mL 0.35 M CuSO4 `aeY wQj| ev‡j¦i †iva 50  n‡j 20 NÈv e ̈env‡ii ci CuSO4 `ae‡Yi NbgvÎv KZ n‡e? [BUET 19-20] ZnSO4 Solution E 0 Zn/Zn2+ = 0.76V E 0 Cu/Cu2+ = – 0.34V Bulb Zn rod Cu rod CuSO4 Solution DËi: 0.3171 M 5. 200 cm2 †ÿÎd‡ji c„ôZjwewkó GKwU avZe Kv‡ci Dci 0.2 mm cyiæ‡Z¡i iƒcvi cÖ‡jc †`qv cÖ‡qvRb| iƒcvi NbZ¡ 1.05  104 kg/m3 | hw` 12.5 A we`y ̈r cÖevwnZ Kiv nq Zvn‡j D3 cÖ‡jc w`‡Z avZe KvcwU‡K KZÿY B‡jK‡UavjvBwUK U ̈vs‡K ivL‡Z n‡e? [Ag = 107.86 g/mol] [BUET 18-19; BUTex 18-19] DËi: 50.1 min 6. wRsK †K¬vivBW e ̈vUvwi‡Z wb‡¤œi †Kvl wewμqv Øviv we`y ̈r Drcbœ nq- Zn(s) + Cl2(g)  ZnCl2(aq) RviY Aa© wewμqv, weRviY Aa© wewμqv wjL I cÖgvY †Kvl wefe E 0 cell †ei Ki| cÖgvY weRviY wefe: E 0 Zn++/Zn = – 0.76 V Ges E 0 Cl2 /Cl – = 1.36 V [BUET 18-19] DËi: Zn  Zn2+ + 2e– (RviY Aa© wewμqv) Cl2 + 2e–  2Cl – (weRviY Aa© wewμqv) cÖgvY †Kvl wefe = 2.12 V 7. wRsK †K¬vivBW e ̈vUvwi‡Z wb‡¤œi †Kvl wewμqv Øviv we`y ̈r Drcbœ nq- Zn(s) + Cl2(g)  ZnCl2(aq) cÖgvY gy3kw3i cwieZ©b (G 0 ) †ei Ki| cÖgvY weRviY wefe: E 0 Zn++/Zn = – 0.76 V and E0 Cl2 /Cl – = 1.36 V [BUET 18-19] DËi: – 409.16 kJ mol–1 8. Au ZworØv‡ii ga ̈ w`‡q AuCl – 4 Avq‡bi `ae‡Y AcwieZ©bxq Zwor cÖevwnZ Kiv nj| 10 wgwbU ci K ̈v‡_v‡Wi fi 1.314 gm e„w× †c‡j Zwor cÖev‡ni gvb wbY©q Ki| (Au Gi cvigvYweK fi = 197) [BUET 17-18] DËi: 3.22 A 9. GKwU †jvnvi wUDe‡K wRsK w`‡q cÖ‡jc w`‡Z n‡e| G m¤úwK©Z wb‡Pi cÖkœ ̧‡jvi DËi `vI| (a) †Kvb avZz K ̈v‡_vW wn‡m‡e e ̈envi Ki‡Z n‡e? (b) †Kvb avZz A ̈v‡bvW wn‡m‡e e ̈envi Ki‡Z n‡e? (c) †Kvb B‡jK‡UavW †_‡K ewnt ̄’ mvwK©‡U B‡jKUab cÖevwnZ n‡e? (d) A ̈v‡bvW-G msNwUZ B‡jK‡UavW wewμqvwU wjL| (e) K ̈v‡_vW-G msNwUZ B‡jK‡UavW wewμqvwU wjL| [BUET 16-17] DËi: (a) †jvnvi wUDe K ̈v‡_vW wn‡m‡e e ̈envi Ki‡Z n‡e| (b) wR1⁄4 A ̈v‡bvW wn‡m‡e e ̈envi Ki‡Z n‡e| (c) A ̈v‡bvW †_‡K ewnt ̄’ mvwK©‡U B‡jKUab cÖevwnZ n‡e| (d) A ̈v‡bv‡W RviY: Zn(s)  Zn2+(aq) + 2e– (e) K ̈v‡_v‡W weRviY: Zn2+(aq) + 2e–  Zn(s) 10. wb‡Pi wewμqvwU 298 K ZvcgvÎvq ̄^ZtùzZ© wK bv Zv wbY©q Ki: Co(s) + Fe2+(aq)  Co2+(aq) + Fe(s) †`Iqv Av‡Q, [Co2+] = 0.15 M; [Fe2+] = 0.68 M; E 0 Co2+/Co = – 0.28 V; E0 Fe2+/Fe = – 0.44 V [BUET 16-17] DËi: Ecell = – 0.14 V; wewμqvwU ̄^Ztù~Z© bv|
2 ....................................................................................................................................  Chemistry 2nd Paper Chapter-4 11. Zn/Zn2+ || Cu2+/Cu, EMF KZ n‡e Zv wnmve Ki| G‡ÿ‡Î Zn2+ Gi NbgvÎv 0.10 mol L–1 Ges Cu2+ Gi NbgvÎv 0.05 mol L–1 | 298 K ZvcgvÎvq E 0 Zn/Zn2+ = 0.70 V Ges E 0 Cu/Cu2+ = – 0.34 V| [BUET 15-16] DËi: 1.0311 V 12. wb‡¤œi Zwor ivmvqwbK †Kvlmg~‡ni Aa©‡Kvl wewμqv I mvgwMÖK †Kvl wewμqv †`LvI| (a) Zn / Zn++(aq) | Cl – (aq), Hg2Cl2(s)/Hg (b) Pb/PbSO4(s), H2SO4(aq) | PbO2/ Pb [BUET 14-15] 13. GKwU ZworØv‡i 0.2 mol/dm3 NbgvÎvi HCl Gi Rjxq `aeY e ̈envi Kiv nj| 27C ZvcgvÎvq ZworØviwUi RviY wefe wbY©q Ki| [BUET 13-14] DËi: 0.0416 V 14. 27C ZvcgvÎvq GKwU ZworØv‡i 0.02 mol dm–3 HCl Gi `aeY e ̈envi Kiv nj| ZworØviwUi RviY wefe wbY©q Ki| [BUET 12-13] DËi: 0.1011 V 15. GKwU Zwor ivmvqwbK †Kv‡l GKwU †jŠn `ЇK wb‡Kj w`‡q Zwor cÖ‡jcb Ki‡Z n‡e| G m¤úwK©Z wb‡Pi cÖkœ ̧‡jvi DËi `vI| (i) †Kvb avZzwU K ̈v‡_vW wnmv‡e e ̈envi Ki‡Z n‡e? (ii) †Kvb avZzwU A ̈v‡bvW wnmv‡e e ̈envi Ki‡Z n‡e? (iii) †Kvb B‡jK‡UavW †_‡K ewnt ̄’ mvwK©‡U B‡jKUab cÖevwnZ n‡e? (iv) A ̈v‡bvW B‡jK‡UavW Gi wewμqvwU wjL| (v) K ̈v‡_vW B‡jK‡UavW Gi wewμqvwU wjL| [BUET 11-12] 16. Kcvi mvj‡d‡Ui Rjxq `ae‡Y ` ̄Ívi P~Y© †hvM Kiv n‡j Kx N‡U? [BUET 10-11] 17. 50 wgwbU a‡i 0.2 A ̈vw¤úqvi we`y ̈r cÖevwnZ nIqvi 0.2 MÖvg Kcvi Rgv nq| Kcv‡ii ivmvqwbK Zzj ̈ IRb wbY©q Ki| [BUET 09-10] DËi: 3.33  10–7 kg C–1 18. h_v_©Zv wePvi K‡i ev‡K ̈ ÒmZ ̈Ó ev Òwg_ ̈vÓ emvI| M ̈vjfvbvBwRs †jvnvi cvBc‡K cathodic protection cÖ`vb K‡i| [BUET 04-05] DËi: wg_ ̈v 19. jNy NaCl `ae‡Yi Zwor we‡køl‡Y Kx cwigvY we`y ̈r cÖev‡ni d‡j 1 NÈv mg‡q Pt K ̈v‡_v‡W cÖgvY Pvc I ZvcgvÎvq 0.112 L H2 Drcbœ n‡e| [BUET 03-04] DËi: 0.268 A 20. 5 mM Fe2+ m¤^wjZ GKwU `aeY Ce4+ w`‡q UvB‡UaU Kiv n‡jv Ges UvB‡Uak‡bi GK ch©v‡q 1 mM Fe3+ •Zix nj| 25C ZvcgvÎvq Aa©‡KvlwUi B.Gg.Gd EFe2+/Fe3+ wnmve Ki| †`Iqv Av‡Q, E 0 Fe2+/Fe3+ = 0.770 V| [BUET 02-03] DËi: 0.8113 Volt 21. GKwU †jvnvi PvgP‡K K ̈v‡_vW wn‡m‡e e ̈envi K‡i Zwor we‡køl ̈ Ni(NO3)2 je‡Yi ga ̈ w`‡q 5.0 amp we`y ̈r 30 wgwbU a‡i Pvjbv Kiv n‡jv| †jvnvi Pvg‡Pi DcwiZ‡ji †ÿÎdj 7.0 cm2 | †jvnvi Pvg‡Pi Dci me©Î mgvbfv‡e m„ó wb‡Kj cÖ‡j‡ci cyiæZ¡ MYbv Ki| [Ni Gi cvigvYweK fi = 58.7 Ges wb‡Kj cÖ‡j‡ci Av‡cwÿK ̧iæZ¡ = 1.4] [BUET 02-03] DËi: 0.28 cm 22. hLb GKwU †jvnvi †c‡iK‡K GKwU bxj Kcvi mvj‡dU `ae‡Yi g‡a ̈ Wzev‡bv nq ZLb †h wewμqv N‡U Zvi bvg wjL Ges wewμqvwU †`LvI| [BUET 01-02] 23. Rjxq CuSO4 `ae‡Yi ga ̈ w`‡q 0.40 amp we`y ̈r GK NÈv Pwjøk wgwbU a‡i cÖevwnZ Ki‡j 0.80 gm Kcvi Rgv nq| Kcv‡ii Zwor ivmvqwbK Zzj ̈v1⁄4 wbY©q Ki| [BUET 01-02] DËi: 3.33  10–4 g/C 24. wb‡¤œi †KvlwUi ZworØvi wewμqv I †Kvl wewμqv ̧wj †`LvI| Hg/Hg2Cl2(s), KCl(aq)||Cu++(aq) /Cu [BUET 00-01] weMZ mv‡j KUET-G Avmv cÖkœvejx 1. 25C ZvcgvÎv I Amxg jNyZvq GKwU GK ÿviKxq `ye©j Gwm‡Wi Zyj ̈ cwievwnZv 388.5 ohm–1 cm2 (g eqv)–1 | we‡qvRb gvÎv 6% n‡j 0.1 M `ae‡Yi Av‡cwÿK cwievwnZv †ei Ki| [KUET 19-20] DËi: 0.03885 ohm–1 cm–1 2. Pt, H2(1 atm) / HCl(Soln ) || CuSO4(Soln ) / Cu †Kv‡li E  Gi gvb 0.337 V n‡j G  f(Cu2+, aq) Gi gvb †ei Ki| [KUET 19-20] DËi: 65.041 kJ 3. Zn(s)/Zn2+(1 M)| Cu2+(1 M)/Cu(s) †KvlwUi emf nj 1.103 V| Avevi Zn2+ + 2e–  Zn, E = – 0.763 V| GB †Kv‡li A ̈v‡bvW wewμqv, K ̈v‡_vW wewμqv I me©‡gvU †Kvl wewμqvi mgxKiY wjL| Ges Kcvi B‡jK‡Uav‡Wi cÖgvY ZworØvi wef‡ei gvb wbY©q Ki| [KUET 05-06] DËi: 0.34 V 4. †μvwgqvg mvj‡dU `ae‡Y 0.0422 amp we`y ̈r 1 NÈv hver cÖevwnZ Kivi d‡j K ̈v‡_v‡W 0.0275 gm †μvwgqvg mwÂZ nq| †μvwgqvg Avq‡bi PvR© KZ? [KUET 04-05] DËi: 3 5. wb¤œwjwLZ M ̈vm Aa©‡Kvl I avZz-avZe jeY-ZworØvi ̧wj ms‡K‡Zi mvnv‡h ̈ cÖKvk Ki Ges Aa©‡Kvl wewμqv wjL| (a) nvB‡Wav‡R‡bi Aa©‡Kvl (b) †K¬vwib M ̈v‡mi Aa©‡Kvl (c) K ̈v‡jv‡gj ZworØvi [KUET 04-05]
Zwor imvqb  Engineering Practice Sheet ....................................................................................................................... 3 6. GKwU Zvgvi Zv‡ii ga ̈ w`‡q 0.001 sec a‡i 0.001 mA Zwor Pvjbv Ki‡j KZwU B‡jKUab cÖevwnZ n‡e? [KUET 03-04; RUET 04-05] DËi: 6.25 × 109 wU 7. wb¤œewY©Z †KvlwUi B.Gg.Gd 31C ZvcgvÎv‡Z wbY©q Ki| †`Iqv Av‡Q (E0 Sn/Sn++ = 0.140 Volt and E0 Fe++/Fe = – 0.036 Volt) Sn/Sn++ (0.1 M) || Fe++ (0.314 M)/Fe. [KUET 04-05] DËi: 0.118 Volt 8. wb‡¤œv3 †KvlwUi ZworPvjK ej KZ n‡e Zv wnmve Ki| Zn/Zn2+||Ag+ /Ag; (Zn/Zn2+ Ges Ag/Ag+ Gi cÖgvY wefe h_vμ‡g + 0.76V Ges – 0.80 V) [CUET 03-04] DËi: 1.56 V 9. wb¤œwjwLZ †KvlwUi B.Gg.Gd Ges gy3 kw3i cwieZ©b 37C ZvcgvÎv‡Z wbY©q Ki| Ag/AgNO3(.3 M) || AgNO3(.5 M)/Ag [KUET 03-04] DËi: Ecell = + 0.01364 volt; GT = – 1316.26 J weMZ mv‡j RUET-G Avmv cÖkœvejx 1. †mvwWqvg Ges K ̈vjwmqvg Gi cvigvYweK fi h_vμ‡g 23 Ges 40| CaCl2 Ges NaCl `ae‡Yi ga ̈ w`‡q mgvb cwigvY we`y ̈r Pvjbv Kiv n‡jv| G‡Z K ̈v‡_v‡W 2.3 g †mvwWqvg Rgv n‡j KZ MÖvg K ̈vjwmqvg Rgv n‡e? G cÖwμqvq Kx cwigvY we`y ̈r Pvjbv Kiv n‡qwQj| [RUET 19-20] DËi: 2 g; 9650 C 2. Kcv‡ii •Zwi AjsKv‡ii Dci 0.1 mm cyiæ †mvbvi cÖ‡jc w`‡Z 0.5 A we`y ̈r cÖevn KZ mgq a‡i Pvjbv Ki‡Z n‡e? [†mvbvi NbZ¡ = 19 × 103 kg m–3 Ges AjsKv‡ii cÖ ̄’‡”Q` = 20 cm2 , †mvbvi Zwor ivmvqwbK Zzj ̈v1⁄4 = 6.38 × 10–7 kg C–1 |] [RUET 19-20] DËi: 3.31 hr 3. Rjxq CuSO4 `ae‡Yi ga ̈ w`‡q 0.40 ampere we`y ̈r GK NÈv Pwjøk wgwbU a‡i cÖevwnZ Ki‡j 0.80 g Kcvi Rgv nq| Kcv‡ii Zwor ivmvqwbK Zzj ̈vsK wbY©q Ki| [RUET 12-13] DËi: 3.33  10–4 g/C 4. (a) 298 K ZvcgvÎvq wb¤œwjwLZ †KvlwUi ZworPvjK ej wnmve Ki: Sn2+/Sn4+||Fe3+/Fe; †`Iqv Av‡Q, E 0 Sn2+/Sn4+ = – 0.15 V Ges E 0 Fe3+/Fe = 0.036 V; Sn4+ = 0.01 M, Sn2+ = 1 M, Fe3+ = 0.2 M (b) NbgvÎv †Kvl Kx? [RUET 09-10] DËi: (a) – 0.06866 V 5. jeY †mZz Kx? bvb©÷ †Kvl mgxKiY cÖ‡qvM K‡i wb‡¤œi ivmvqwbK †Kv‡li ZworPvjK ej wbY©q Ki| Mg(s)/Mg2+(0.001 M) || Cu2+(0.0001 M)/Cu(s) †hLv‡b, E 0 Mg/Mg 2+ = 2.37 V, E0 Cu2+/Cu = 0.34 V [RUET 08-09] DËi: 2.68 V 6. Zn(s) / Zn2+(1 M) || Cu2+ (1 M) / Cu(s) †KvlwUi emf 1.103 V| Avevi Zn2+ + 2e–  Zn, E = – 0.763 V| G †Kv‡li A ̈v‡bv‡W wewμqv, K ̈v‡_v‡W wewμqv I me©‡gvU †Kvl wewμqvi mgxKiY wjL Ges Kcvi B‡jK‡Uav‡Wi cÖgvY ZworØvi wef‡ei gvb wbY©q Ki| [RUET 07-08] DËi: + 0.34 V 7. mvjwdDwiK Gwm‡Wi jNy Rjxq `ae‡Yi ga ̈ w`‡q cøvwUbvg Zv‡ii gva ̈‡g 1 NÈv we`y ̈r cÖevwnZ Kivq Av`k© ZvcgvÎv I Pv‡c 250 mL nvB‡Wav‡Rb M ̈vm Drcbœ nq| we`y ̈‡Zi gvÎv KZ wQj? [RUET 06-07] DËi: 0.598 A 8. wb‡¤œi ivmvqwbK wewμqvq †Wwb‡qj †KvlwUi ZworPvjK ej (emf) wnmve Ki| E 0 Zn/Zn2+ = 0.76 V Ges E 0 Cu2+/Cu = 0.34 V Zn/Zn2+(0.1 M)(aq) || Cu2+(0.05 M)(aq)/ Cu Zn(s) + Cu2+(aq)  Zn2+(aq) + Cu(s) [RUET 06-07] DËi: 1.091 V 9. B‡jK‡Uav‡cøwUs Gi e ̈envi wjL? [RUET 04-05; BUTex 04-05] 10. wb‡¤œv3 ivmvqwbK wewμqvi †Kv‡li ZworPvjK ej (emf) wnmve Ki| Mg(s) + 2Ag+ (aq)  Mg2+(aq) + 2Ag(s) [Mg2+] = 0.13 M and [Ag+ ] = 1.0  10–4 M at 25C, E0 Ag+ /Ag= + 0.80 V E 0 Mg 2+/Mg= – 2.37 V [RUET 04-05, 05-06] DËi: 2.96 V 11. 25C ZvcgvÎvq wb‡¤œi †Kvl ̧‡jvi ZworPvjK ej MYbv Ki| Fe,Cu I Sn Gi E 0 ox Gi gvb h_vμ‡g 0.44, – 0.337 I 0.14 V| (A) Fe/Fe2+ ||Cu2+/Cu (B) Sn/Sn2+||Fe2+/Fe [RUET 03-04] DËi: (A) 0.777 V; – 0.3 V 12. AgNO3 `ae‡Yi ga ̈ w`‡q 10 wgwbU 0.25 A ̈vw¤úqvi kw3m¤úbœ we`y ̈r cÖevn Pvjbv Kivq K ̈v‡_vW 0.1679 g Ag Rgv nq| Aci GKwU AgNO3 `ae‡Y 50 wgwbU 0.20 A ̈vw¤úqvi kw3m¤úbœ we`y ̈r cÖevn Pvjbv Ki‡j K ̈v‡_v‡W KZ cwigvY Ag mwÂZ n‡e? [RUET 03-04] DËi: 0.672 g weMZ mv‡j CUET-G Avmv cÖkœvejx 1. GKwU A ̈vjywgwbqvg wk‡í •`wbK 20 ton A ̈vjywgwbqvg avZz Drcv`b nq| hw` •`wbK mgq 30000 sec Kvh©Ki nq Z‡e G‡Z •`wbK KZ d ̈viv‡W we`y ̈r I KZ Amp we`y ̈r kw3i cÖ‡qvRb n‡e? [CUET 13-14] DËi: 2.222  106 F; 7.15  106 A 2. Zzu‡Zi Rjxq `ae‡Y 160 mA kw3i we`y ̈r 40 min a‡i Pvjbv Kiv nj| B‡jK‡Uav‡W mwÂZ Kcvi cigvYyi msL ̈v wbY©q Ki| [CUET 08-09; RUET 15-16] DËi: 1.198  wU
4 ....................................................................................................................................  Chemistry 2nd Paper Chapter-4 3. jNy mvjwdDwiK Gwm‡Wi g‡a ̈ cøvwUbvg ZworØv‡ii mvnv‡h ̈ KZ gvÎvi Zwor cÖevn 30 min cÖevwnZ Ki‡j Av`k© DòZv I Pv‡c ZworØv‡i 336 cm3 nvB‡Wav‡Rb Drcbœ n‡e? [CUET 07-08] DËi: 1.61 A 4. 25C ZvcgvÎvq wb‡Pi †KvlwUi e.m.f wbY©q Ki: Fe/FeSO4 (0.1 M)||CuSO4(0.01 M)/Cu; †`Iqv Av‡Q, E 0 Fe/Fe 2+ = + 0.44 V; E0 Cu/Cu2+ = – 0.34 V [CUET 05-06] DËi: 0.75 Volt 5. wmjfvi bvB‡UaU `ae‡Yi ga ̈ w`‡q 1.5 A we`y ̈r KZÿY a‡i cÖevwnZ Ki‡j 1.89 gm wmjfvi mwÂZ n‡e? [CUET 04-05] DËi: 1125.83 s 6. CaCl2 Gi `ae‡Y 50.0 mA Zwor KZ mgq a‡i cÖevwnZ Ki‡j 4.6  1018 wU K ̈vjwmqvg cigvYy B‡jK‡Uav‡W Rgv n‡e? [CUET 03-04; RUET 05-06] DËi: 29.48 s weMZ mv‡j BUTex-G Avmv cÖkœvejx 1. 200 mL 0.5 M Cu2+ K ̈v‡_vW `ae‡Y 2 amp Zwor 30 min Pvjbv Ki‡j `ae‡Yi NbgvÎv KZ n‡e? [Cu = 63.5] [BUTex 18-19] DËi: 0.405 M 2. ` ̄Ív wbwg©Z cv‡Î Kcvi mvj‡dU `aeY ivLv hv‡e wK bv e ̈vL ̈v Ki| [E0 Zn/Zn2+ = 0.76 V, E 0 Cu2+/Cu = 0.34 V] [BUTex 18-19] DËi: E 0 cell= 1.1 V > 0 wewμqvwU ̄^Ztù~Z©, A_©vr `aeYwU ivLv hv‡e bv| MCQ weMZ mv‡j BUET-G Avmv cÖkœvejx 1. †KvbwU jeY †mZz‡Z e ̈eüZ nq? [BUET 22-23] NaCl AgNO3 Ge NH4NO3 2. Cr2(SO4)3 `ae‡Y 5 A Zwor 20 min a‡i cÖevwnZ n‡j K ̈v‡_v‡W Kx cwigvY Cr mwÂZ n‡e? [BUET 22-23] 0.77 g 1.077 g 2.077 g 3.077 g 3. †h †Kvl Zwor kw3‡K ivmvqwbK kw3‡Z iƒcvšÍwiZ K‡i, Zv‡K ejv nqÑ [BUET 13-14] Zwor we‡kølY †Kvl M ̈vjfvwbK †Kvl R¡vjvwb W ̈vwb‡qj †Kvl 4. cUvwkqvg bvB‡Ua‡Ui GKwU Rjxq `aeY‡K Zwor we‡kølY Ki‡j wb‡¤œi †Kvb M ̈vm/M ̈vmmg~n Drcbœ n‡e? [BUET 13-14] H2/NO2 O2/NO2 NO2 H2/O2 5. wb‡Pi †KvbwU Zwor †Kv‡li jeY †mZz‡Z e ̈eüZ nq?[BUET 11-12] NH4NO3 KCl Carbon NH4Cl 6. wmjfvi bvB‡UaU Gi Rjxq `ae‡Yi g‡a ̈ 0.2 A we`y ̈r 30 min mgq a‡i Pvjbv Ki‡j Kx cwigvY wmjfvi Rgv n‡e? (wmjfv‡ii cvigvYweK fi = 108) [BUET 10-11] 0.108 g 0.430 g 0.403 g 0.540 g ANSWER BOX 1 2 3 4 5 6 weMZ mv‡j CKRUET-G Avmv cÖkœvejx 1. Kg `v‡gi avZzi •Zwi 10 wU †PBb Gi Dci †Mv‡ìi cÖ‡jc w`‡Z †Mvì je‡Yi (Au3+) `ae‡Y †Mvì A ̈v‡bvW e ̈envi K‡i 5.0 A we`y ̈r 10 wgwbU a‡i Pvjbv Kiv nq| cÖwZ 10 MÖvg †Mv‡ìi `vg 50,000 UvKv n‡j cÖwZ †PB‡b KZ UvKvi †Mvì e ̈eüZ n‡q‡Q? (Au Gi cvigvYweK fi = 196.97) [CKRUET 23-24] Tk. 850 Tk. 1990 Tk. 1530 Tk. 1770 Tk. 1020 2. 0.16 A we`y ̈r 2400 s a‡i GKwU CuSO4 `ae‡Yi g‡a ̈ Pvjbv Kiv n‡j ZworØv‡i mwÂZ Kcvi cigvYyi cwigvY KZ? [CKRUET 23-24] 1.2851 × 1021 1.1256 × 1021 1.2134 × 1021 1.3154 × 1021 1.1981 × 1021 3. GKwU dz‡qj †m‡ji g‡a ̈ 1 atm Pv‡c Ges 25C ZvcgvÎvq weD‡Ub M ̈vm‡K `nb Ki‡j wb‡¤œi mgxKiY cvIqv hvq- C4H10(g) + 13 2 O2(g)  4CO2(g) + 5H2O(l) G 0 = – 2762 kJ mol–1 n‡j †m‡ji cÖgvb ZworPvjK e‡ji gvb †ei Ki| [CKRUET 23-24] 2.3010 V 0.7810 V 0.9102 V 1.1008 V 0.7132 V 4. 5 amp gvÎvi Zwor 60 minute a‡i CuSO4 `ae‡Yi ga ̈ w`‡q Pvjbv Ki‡j K ̈v‡_v‡W Kx cwigvY Kcvi mwÂZ n‡e? [CKRUET 22-23] 11.845 g 2.367 g 5.922 g 23.689 g 59.222 g