Tiêu đề Chemistry Cycle Engg. Practice Sheet With Solve.pdf ✅

̧YMZ imvqb  Chemistry Cycle Engineering Practice Sheet ........................................................................................... 1 ̧YMZ imvqb Qualitative Chemistry WRITTEN weMZ mv‡j BUET-G Avmv cÖkœvejx 1. wiWevM© mgxKiYwU †jL| H–cigvYyi evgvi wmwi‡Ri GKwU †iLv eY©vwji Zi1⁄2‣`N ̈© (nm-G) wbY©q Ki, hLb B‡jKUab D”P kw3 ̄Íi, n2 = 4 †_‡K jvwd‡q P‡j Av‡m| [wiWevM© aaæeK, RH = 1.09678  107m –1 ] [BUET 20-21] mgvavb: 1  = RH     1 n1 2 – 1 n2 2 Z 2 n1 = 2 (evgvi), n2 = 4; Z = 1 1  = 1.09678  107     1 2 2 – 1 4 2   = 4.8627  10–7 m = 486.27  10–9 m   = 486.27 nm 2. †ev‡ii g‡Wj Abyhvqx B‡jKUa‡bi kw3 E = –RH/n2 mgxKiY †_‡K wnmve Kiv hvq, †hLv‡b, RH = 2.18  10–18 J Ges n n‡jv cÖavb †Kvqv›Uvg msL ̈v| hw` B‡jKUab n = 3 kw3 ̄Íi †_‡K wb¤œ kw3 ͇̄i ̄’vbvšÍ‡ii d‡j Drcbœ †dvUb Balmer Series G GKwU jvBb eY©vwj •Zwi K‡i, Zvn‡jÑ (i) wewKwiZ †dvU‡bi kw3i mgxKiYwU †ei Ki| (ii) D3 mgxKi‡Yi mvnv‡h ̈ Drcbœ †dvU‡bi Zi1⁄2‣`N© ̈ b ̈v‡bvwgUv‡i wbY©q Ki| [BUET 19-20] mgvavb: †h‡nZz B‡jKUa‡bi ̄’vbvšÍ‡ii d‡j Balmer Series G GKwU jvBb eY©vwj cvIqv hvq, myZivs B‡jKUabwU 2q kw3 ͇̄i (n = 2) ̄’vbvšÍwiZ nq| (i) E1 = – RH 3 2 (n = 3) E2 = – RH 2 2 (n = 2) E = E1 – E2 = RH 2 2 – RH 3 2  wewKwiZ kw3i mgxKiY, E = RH     1 4 – 1 9 = 5 36 RH (ii) wewKwiZ kw3 = 5 36 RH = ( 5 36 × 2.18 × 10–18) = 3.0278  10–19 J E = hc    = hc E = 6.63 × 10–34 × 3 × 108 3.0278 × 10–19   = 656.52 nm 3. N2, O2, H2cigvYy ̧‡jv IR †iwW‡qkb †kvlY K‡i bv †Kb? [BUET 19-20] mgvavb: N2, O2, H2 Gi g‡Zv cÖwZmg wØcigvYyK AYy ̧‡jv‡Z †Kv‡bv AhyMj B‡jKUab bv _vKvq G‡`i WvB‡cvj †gv‡g›U k~b ̈ nq| ZvB Giv IR †iwW‡qkb †kvlY K‡i bv| 4. †Zvgvi Kv‡Q kbv3Kvix wPý Qvov Zn2+, Fe2+, Fe3+Ges Al 3+ Gi PviwU wfbœ wfbœ Rjxq `aeY i‡q‡Q| Zv‡`i‡K kbv3 Kivi Rb ̈ GKwU weKvi‡Ki bvg wjL Ges kbv3Kvix wewμqvmg~n †`LvI| [BUET 19-20] mgvavb: weKviKwU n‡jv NH4OH (A ̈v‡gvwbqvg nvB‡Wav·vBW `aeY) Zn2+(aq) + 2NH4OH(aq)  Zn(OH)2(s) + 2NH + 4 (aq) [mv`v Aat‡ÿc] Fe2+(aq) + 2NH4OH(aq)  Fe(OH)2(s) + 2NH + 4 (aq) [meyR Aat‡ÿc] Fe3+(aq) + 3NH4OH(aq)  Fe(OH)3(s) + 3NH + 4 (aq) [ev`vwg Aat‡ÿc] Al 3+(aq) + 3NH4OH(aq)  Al(OH)3(s) + 3NH + 4 (aq) [mv`v †Rwji g‡Zv fvmgvb] 5. (a) Zwor Pz¤^Kxq eY©vwji wewfbœ A‡ji †Kvb iwk¥ ̧‡jv wb¤œwjwLZ Kv‡R e ̈eüZ nq? (i) WiFi; (ii) Detecting fake currency; (iii) Optical fiber communication (iv) MRI machine (b) †Zvgvi Dˇii iwk¥ ̧‡jv‡K Zv‡`i Zi1⁄2‣`‡N ̈©i wb¤œZi μgvbymv‡i mvwR‡q wjL| [BUET 18-19] mgvavb: (a) (i) WiFi  gvB‡μvI‡qf (ii) Detecting fake currency  AwZ‡e ̧wb iwk¥ (iii) Optical fiber communication  Ae‡jvwnZ iwk¥ (iv) MRI machine  †iwWI Zi1⁄2 (b) †iwWI I‡qf > gvB‡μvI‡qf > Ae‡jvwnZ iwk¥ > AwZ‡e ̧wb iwk¥|
2 ....................................................................................................................................  Chemistry 1st Paper Chapter-2 6. wb¤œwjwLZ mswÿß iƒcmg~‡ni c~Y©iƒc wjL| (i) DPF (ii) FTIR (iii) AAS (iv) MRI (v) BTU [BUET 18-19] mgvavb: (i) DPF  Diesel Particulate Filter (ii) FTIR  Fourier Transform Infrared Spectroscopy (iii) AAS  Atomic Absorption Spectrometry (iv) MRI  Magnetic Resonance Imaging (v) BTU  British Thermal Unit 7. 200 mL 1.3  10–3 M NbgvÎvi AgNO3 `ae‡Yi mv‡_ 100 mL 4.5  10–5 M NbgvÎvi Na2S `aeY †gkv‡bv nj| G‡Z wK †Kv‡bv Aat‡ÿc co‡e? hyw3 `vI| [Ksp = 1.6  10–49] [BUET 18-19] mgvavb: 2AgNO3 + Na2S ⇌ Ag2S + 2NaNO3; Ag2S ⇋ 2Ag+ + S2– Ag+ Gi cÖ_g NbgvÎv = 1.3  10–3 M Ag+ Gi †kl NbgvÎv = V1S1 V2 = 200  1.3 10–3 300 = 8.667  10–4 M S 2– Gi cÖ_g NbgvÎv = 4.5  10–5 M S 2– Gi †kl NbgvÎv = 100 4.5  10–5 300 = 1.5  10–5 M Ag2S Gi Kip = [Ag+ ] 2 × [S2– ] = (8.667  10–4 ) 2  1.5  10–5 = 1.1267  10–11 †h‡nZz Kip > Ksp †m‡nZz `ae‡Y Ag2S Gi Aat‡ÿc co‡e| 8. (a) 4d Dckw3 ͇̄i AiweUvj ̧‡jvi Rb ̈ n, l I m Gi gv‡bi ZvwjKv wjL| (b) cÖavb †Kvqv›Uvg msL ̈v n = 3 n‡j H kw3 ͇̄i me©vwaK KqwU B‡jKUab _vK‡Z cv‡i? [BUET 16-17] mgvavb: (a) 4d Dckw3 ͇̄ii Rb ̈, n = 4 l = 2 m = – 2, – 1, 0, + 1, + 2 (b) n = 3 n‡j, H kw3 ͇̄i me©vwaK 2n2 = 2  3 2 = 18wU B‡jKUab _vK‡Z cv‡i| 9. `ae‡Y Cl – Avq‡bi Dcw ̄’wZ Kxfv‡e wbwðZ Ki‡e? [BUET 16-17] mgvavb: Cl – Avqb wewkó `ae‡Y K‡qK †dvuUv AgNO3 †hvM Ki‡j AgCl Gi mv`v Aat‡ÿc c‡o| NaCl(aq) + AgNO3(aq)  AgCl(s) + NaNO3(aq) Drcbœ AgCl Gi Aat‡ÿc jNy HNO3 G `aeYxq wKš‘ NH4OH `ae‡Yi mv‡_ [Ag(NH3)2Cl] bvgK RwUj †h.M •Zwi K‡i| AgCl(s) + 2NH4OH(aq)  [Ag(NH3)2]Cl(aq) + 2H2O(l) 10. Ag2CO3 (Ksp = 8.2 10–12) Ges CuCO3 (Ksp = 2.5 10–10) Gi `ave ̈Zv wbY©q Ki Ges †Kvb Kve©‡bUwUi `ave ̈Zv Kg D‡jøL Ki| [BUET 16-17] mgvavb: awi, Ag2CO3 Gi `ave ̈Zv = S1 Ges CuCO3 Gi `ave ̈Zv = S2 Ag2CO3 ⇌ 2Ag+ + CO2– 3 S1 2S1 S1 S1  (2S1) 2 = Ksp  4S1 3 = 8.2  10–12  S1 = 1.27  10–4 mol L–1 CuCO3 ⇌Cu2+ + CO2– 3 S2 S2 S2 S2  S2 = Ksp = 2.5 10–10  (S2) 2 = 2.5  10–10  S2 = 1.58  10–5 mol L–1  CuCO3 Gi `ave ̈Zv A‡cÿvK...Z Kg| 11. Mg(OH)2 Gi `ave ̈Zv KZ? `ave ̈Zvi ̧Ydj, Ksp = 1.2  10–12 [BUET 15-16] mgvavb: Mg(OH)2 ⇌ Mg2+ + 2OH– x x 2x  `ave ̈Zvi ̧Ydj = [Mg2+] × [OH– ] 2 = x  (2x)2 = 4x3 GLb, 4x3 = 1.2  10–12  x = 6.69  10–5 mol L–1 12. nvB‡Wav‡Rb cigvYyi B‡jKUab 2q kw3 ̄Íi †_‡K 1g kw3 ͇̄i jvd †`Iqvi d‡j m„ó eY©vwj †iLvi Zi1⁄2 •`N ̈© () Gi gvb wbY©q Ki †`Iqv Av‡Q, RH = 109677 cm–1 [BUET 14-15] mgvavb: 1  = RH     1 n1 2 – 1 n2 2 . Z2  1      1 1 1 – 1 2 2 GLv‡b, n1 = 1 n2 = 2  1      1 1 – 1 4   = 1.21569  10–5 cm = 1215.69 A 13. GKwU B‡jKUab D”P kw3 ̄Íi †_‡K wb¤œ kw3 ͇̄i jvd w`‡j wK N‡U? [BUET 14-15] mgvavb: †dvUb wn‡m‡e kw3i wewKiY N‡U| 14. cÖavb †Kvqv›Uvg msL ̈v n = 3 n‡j Ab ̈vb ̈ †Kvqv›Uvg msL ̈v ̧‡jv wK wK? [BUET 14-15] mgvavb: n = 3 l = 0, 1, 2 m = 0, (+ 1, 0, – 1), (+ 2, + 1, 0, – 1, – 2) s =    +  1 2  – 1 2 15. †ev‡ii cigvYy g‡Wj Abymv‡i wbDwK¬qv‡mi PZzw`©‡K N~Y©vqgvb B‡jKUa‡bi †K.wYK fi‡eM Gi mgxKiY wjL| [BUET 14-15] mgvavb: mvr = nh 2 ; n = 1, 2, 3 ......... [h = cøv‡1⁄4i aaæeK; r = n Zg Kÿc‡_i e ̈vmva©]
̧YMZ imvqb  Chemistry Cycle Engineering Practice Sheet .......................................................................................... 3 16. -iwk¥ KYvi Av‡cwÿK fi k~b ̈| †Kvb †ZRw ̄Œq †g.j †_‡K -iwk¥ wbM©Z n‡j †g.jwUi cvigvYweK msL ̈v GK GKK e„w× cvq wKš‘ cvigvYweK fi GKB _v‡K| GwU wKfv‡e m¤¢e? [BUET 13-14] mgvavb: -KYv nj g~jZ B‡jKUa‡bi cÖevn|  KYvi PvR© – 1 aiv nq Ges Gi fi B‡jKUa‡bi b ̈vq AwZ bMY ̈| ZvB †Kv‡bv †g.j †_‡K  KYv wbtmwiZ n‡j 1wU wbDUab †f‡O †cÖvU‡b cwiYZ nq| d‡j †gvU fi msL ̈v GKB _v‡K wKš‘ cvigvYweK msL ̈v 1 GKK ev‡o| †hgb: 232 90 Th – 0 –1 e  232 91 Pa 17. GKwU B‡jKwUaK evj¦ njy` is‡qi Av‡jv (wewKiY) Qovq hvi Zi1⁄2‣`N ̈© 589 nm, wb‡ÿwcZ †dvU‡bi kw3 KZ Ryj? (†`Iqv Av‡Q h = 6.624  10–34 J s) [BUET 06-07] mgvavb:  = 589 nm = 589  10–9 m E = h = h c  = 6.624  10–34  3  108 589  10–9 = 3.374  10–19 J 18. hLb mnKvix †Kvqv›Uvg msL ̈v, l = 3, ZLb Ab ̈vb ̈ †Kvqv›Uvg msL ̈v ̧wj wK wK? [BUET 06-07] mgvavb: mnKvix †Kvqv›Uvg msL ̈v cÖavb †Kvqv›Uvg msL ̈v g ̈vM‡bwUK †Kvqv›Uvg msL ̈v w ̄úb †Kvqv›Uvg msL ̈v l = 3 n = 4, 5, 6,.... m = 0,  1,  2,  3 s =  1 2 19. û‡Ûi wbqg wjL| [BUET 06-07] mgvavb: GKB kw3m¤úbœ B‡jKUab ̧‡jv wewfbœ AiweUv‡j me©vwaK msL ̈K we‡Rvo Ae ̄’vq _vK‡Z n‡e| GB me AhyM¥ B‡jKUa‡bi w ̄úb GKBgyLx n‡e| 20. k~b ̈ ̄’vb c~iY Ki| jyB wW-eaMwj cÖ`Ë  mgxKiYwU B‡jKUa‡bi KYv I Zi1⁄2 m¤úwK©Z| [BUET 04-05] mgvavb:  = h mv  = B‡jKUa‡bi Zi1⁄2 •`N© ̈ h = cøv‡1⁄4i aaæeK m = B‡jKUa‡bi fi v = B‡jKUa‡bi †eM 21. 25C ZvcgvÎvq AgCl Gi 100 mL m¤ú„3 `ae‡Yi mv‡_ 0.03 M NaBr Gi 100 mL `aeY †hvM Kiv n‡jv| Aat‡ÿc •Zwi n‡e wK? [Ksp(AgCl) = 1  10–10; Ksp(AgBr) = 5  10–13] [BUET 04-05] mgvavb: AgCl ⇌Ag+ + Cl – Ksp = S2 = 1 × 10–10  S = Ksp = 1  10–10 = 10–5 M  wewμqvi ïiæ‡Z, [Ag+ ] = [Cl – ] = 10–5 mol/L Avevi, NaBr  Na+ + Br–  wewμqvi ïiæ‡Z, [Br– ] = [Na+ ] = 0.03 mol/L Kip(AgBr) = [Ag+ ] × [Br– ] =     10–5 × 100 200 ×     0.03 × 100 200 = 7.5 × 10–8 †h‡nZzKip > Ksp myZivs, AgBr Gi Aat‡ÿc co‡e| 22. GKwU †g.‡ji cigvYy ̧wji wb¤œwjwLZ cÖvK...wZK cÖvPzh© I AvB‡mv‡UvwcK fi i‡q‡Q| †g.jwUi Mo cvigvYweK fi wnmve Ki| cÖvPzh© : 90.92% 0.26% 8.82% cvigvYweK fi : 19.99 amu 20.99 amu 21.99 amu [BUET 02-03] mgvavb: Mo cvigvYweK fi = 90.92  19.99 + 0.26  20.99 + 8.82  21.99 100 = 20.169 amu 23. †μvwgqv‡gi B‡jKUab web ̈vm wjL| [BUET 01-02] mgvavb: Cr(24) = 1s2 2s2 2p6 3s2 3p6 3d5 4s1 24. †μvwgqv‡gi fi msL ̈v 52| †μvwgqv‡gi cigvYy‡Z 28 wU wbDUab _vK‡j Gi cvigvYweK msL ̈v I B‡jKUab msL ̈v wbY©q Ki| [BUET 01-02] mgvavb: fi msL ̈v, A = 52 wbDUab msL ̈v, n = 28 cvigvYweK msL ̈v, Z = A – n = 52 – 28 = 24  B‡jKUab msL ̈v, e = Z = 24 25. (i) p Ges f mve‡kj mg~‡n h_vμ‡g KqwU K‡i AiweUvj Av‡Q? (ii) Aby‡ËwRZ Ae ̄’vq bvB‡Uav‡Rb I A ̈vjywgwbqvg cigvYy؇qi AiweUv‡j B‡jKUab wPÎmn †`LvI| [BUET 01-02] mgvavb: (i) p †Z 3wU I f †Z 7wU| N (ii) N(7)  1s2 2s2 2p1 x 2p1 y 2p1 z ↿⇂ ↿⇂ ↿ ↿ ↿ Al(13) = 1s2 2s2 2p6 3s2 3p1 x 3p0 y 3p0 z ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ 1s 2s 2p ↿⇂ ↿ 1s 2s 2p 3s 3p Al
4 ....................................................................................................................................  Chemistry 1st Paper Chapter-2 weMZ mv‡j KUET-G Avmv cÖkœvejx 1. Møy‡KvR GKwU Zvcnvix `ae| 100C ZvcgvÎvq cvwb‡Z Gi `ave ̈Zv 45.5| G ZvcgvÎvq `ae‡Yi Av‡cwÿK ̧iæZ¡ 0.95| GB Ae ̄’vq Møy‡Kv‡Ri 250 mL m¤ú„3 `aeY‡K 10C ZvcgvÎvq kxZj Kiv n‡j 11.5 g Møy‡KvR Aatwÿß nq| 10C ZvcgvÎvq Møy‡Kv‡Ri `ave ̈Zv KZ? [KUET 19-20] mgvavb: `ae‡Yi fi = (0.95  250) g = 237.5 g 100C ZvcgvÎvi m¤ú„3 `aeY‡K 10C ZvcgvÎvq kxZj Kiv n‡j, 273.5 g `ae‡Y Aat‡ÿc c‡o = 11.5 g  145.5 g `ae‡Y Aat‡ÿc c‡o = 11.5 × 145.5 237.5 = 7.045 g  10C ZvcgvÎvq `ae‡Yi `ave ̈Zv = 45.5 – 7.045 = 38.45 weKí: `ae‡Yi fi = (0.05 × 250) g = 237.5 g  100C ZvcgvÎvq, `ave ̈Zv = m × 100 M – m  45.5 = m × 100 237.5 – m  m = 74.27 g  `ave‡Ki fi = (237.5 – 74.27) g = 163.23 g  10C ZvcgvÎvq, `ave ̈Zv = `a‡ei fi `ave‡Ki fi × 100 = 74.27 – 11.5 163.23 × 100 = 38.455 2. wb‡Pi †Kvb MÖæcwU‡K cigvYy ejv hvq? [KUET 04-05] A B C Proton 12 12 16 Neutron 16 16 16 Electron 16 12 12 mgvavb: †Kv‡bv cigvYyi wbDwK¬qv‡m Dcw ̄’Z †gvU †cÖvUb msL ̈v I wbDwK¬qv‡mi evB‡i wewfbœ Kÿc‡_ N~Y©vqgvb †gvU B‡jKUab msL ̈v me©`v mgvb| DÏxc‡Ki ‘B’ MÖæ‡cB ïaygvÎ †cÖvUb I B‡jKUab msL ̈v mgvb| ZvB B MÖæcwU‡K cigvYy ejv hvq| 3. wb‡¤œi wewμqv ̧wj m¤ú~Y© Ki| [KUET 04-05] A. 14 7N + 4 2He  B. 235 92U + 1 0 n  C. Fe3+ + 2e– D. Al + – 2e–  E. 239 93Np -ray  mgvavb: A. 14 7 N + 4 2He  17 8 O + 1 1H B. 235 92 U + 1 0 n  141 56 Ba + 92 36Kr + 31 0 n C. Fe3+ + 2e–  Fe+ D. Al + – 2e–  Al 3+ E. 239 93Np -ray  239 94Pu 4. 239 93Np cigvYyi cÖwZ wbDwK¬q‡bi eÜb kw3 MeV †Z wbY©q Ki, hvi cÖK...Z fi 237.81 amu| (wbDUab, †cÖvUb Ges B‡jKUab Gi fi h_vμ‡g 1.0086 amu, 1.0074 amu Ges 0.00054 amu) [KUET 04-05] mgvavb: 239 93Np wbDwK¬qv‡mi fi = 93  1.0074 + (239 – 93)  1.0086 = 240.9438 amu 239 93Np wbDwK¬qv‡mi cÖK...Z fi = 237.81 amu fiÎæwU, m = (240.9438 – 237.81) amu = 3.1338 amu = 3.134  (1.6605  10–27) kg = 5.204  10–27 kg  eÜb kw3, E = mc2 = (5.204  10–27)  (3  108 ) 2 = 4.683  10–10J = 2927.19 MeV 5. (a) Av‡jv wK? (b) †h wewKi‡Yi Zi1⁄2‣`N ̈© 1.75  10–4 cm, Zvi wd«‡Kv‡qwÝ ev ̄ú›`b msL ̈v wbY©q Ki| [KUET 03-04] mgvavb: (a) Av‡jv n‡jv Zwor Pz¤^Kxq Zi1⁄2 hvi `„k ̈gvb Zi1⁄2‣`N ̈© 380 nm – 780 nm (b) c =  GLv‡b, Av‡jvi †eM, c = 3 × 108 ms–1 Zi1⁄2‣`N© ̈,  = 1.75 × 10–4 cm = 1.75 × 10–6 m   = c  = 3  108 1.75  10–6 = 1.71  1014 Hz weMZ mv‡j RUET-G Avmv cÖkœvejx 1. wb¤œwjwLZ wewμqv ̧‡jv m¤ú~Y© Ki| [RUET 18-19] (a) 4Fe3+(aq) + 3K4[Fe(CN)6]  (b) 2K2[HgI4](aq) + 2NH3(g)  (c) P4(s) + 3OH– (aq) + 3H2O(l)  (d) SeO2 + H2O  mgvavb: (a) 4Fe3+(aq) + 3K4[Fe(CN)6](aq)  Fe4[Fe(CN)6]3(s) + 12K + (aq) (b) 2K2[HgI4](aq) + 2NH3(g)  NH2[Hg2I3](s) + 4KI(aq) + NH4I(aq) (c) P4(s) + 3OH– (aq) + 3H2O(l)  PH3 + 3H2PO– 2 (d) SeO2 + H2O  H2SeO3 2. cÖvK...wZK Aw·‡R‡b 16O,17O Ges 18O Gi cwigvY h_vμ‡g 99.76%, 0.037% Ges 0.204% n‡j Aw·‡R‡bi cvigvYweK fi wbY©q Ki| [RUET 17-18] mgvavb: Aw·‡R‡bi cvigvYweK fi = (16 × 99.76) + (17 × 0.037) + (18 × 0.204) 100 amu = 16.00461 amu = 16 amu