Tiêu đề পরিবেশ রসায়ন MCQ Practice-Sheet With Solve.pdf ✅

cwi‡ek imvqb  Varsity Practice Sheet 1 cÖ_g Aa ̈vq cwi‡ek imvqb Environmental Chemistry ACS Chemistry Department Gi g‡bvbxZ eûwbe©vPwb cÖkœmg~n evqygЇji MVb I Dcv`vb 1. ÷av‡Uvwùqv‡i ZvcgvÎv †ewk nq, KviYÑ [BUET 21-22] c„w_exi Lye Kv‡Q m~‡h©i Lye Kv‡Q we‡kl ivmvqwbK wewμqv nq I‡Rvb ͇̄ii iwk¥ †kvl‡Yi Rb ̈ DËi: I‡Rvb ͇̄ii iwk¥ †kvl‡Yi Rb ̈ 2. wb‡¤œi †KvbwU‡K cÖgvY evqyPv‡c Zvc w`‡q Zi‡j cwiYZ Kiv hvq bv? [BUET 10-11] b ̈vc_vwjb Lvevi jeY CuCl2 †jvnv DËi: b ̈vc_vwjb e ̈vL ̈v: †h mKj c`v_©‡K mvaviY evqy Pv‡c Zi‡j cwiYZ Kiv hvq bv A_©vr hviv KwVb n‡Z mivmwi ev‡®ú cwiYZ nq Zviv DaŸ©cvwZZ c`v_©| †hgb- b ̈vc_vwjb, wbkv`j (NH4Cl), MÜK, †ebwRb, Av‡qvwWb| 3. wb‡Pi †KvbwU wgVv cvwbi me©e„nr Drm? [MAT 21-22; DAT 19-20] DËi †giæi eid f~Mf© ̄ cvwb `wÿY †giæi eid b`xi cvwb DËi: DËi †giæi eid e ̈vL ̈v: wgVv cvwbi me©e„nr Drm DËi †giæi eid| c„w_exi cÖvq 1.99% cvwb Av‡m DËi †giæi eid †_‡K| GQvov `wÿY †giæi eid †_‡K 0.1%, f~-Mf© ̄ cvwb †_‡K 0.635%, n«‡`i cvwb †_‡K 0.009%, b`xi cvwb †_‡K 0.001% cvwb cvIqv hvq| 4. m~‡h©i UV wewKi‡Yi ÿwZKi cÖfve †_‡K myiÿv †`qÑ [MAT 21-22] AvqbgÛj (ionosphere) I Ua‡cvgÛj (troposphere) G _vKv I‡Rvb ̄Íi (O3) AvqbgÛ‡j (ionsphere) _vKv I‡Rvb ̄Íi (O3) ÷a‡cvgÛ‡j (troposphere) _vKv †gNgvjv ÷av‡Uvwùqv‡i (stratosphere) _vKv I‡Rvb ̄Íi (O3) DËi: ÷av‡Uvwùqv‡i (stratosphere) _vKv I‡Rvb ̄Íi (O3) 5. †Kvb M ̈vmwU evZv‡m me‡P‡q †ewk cwigv‡Y _v‡K? [MAT 19-20] Hydrogen Nitrogen Carbon dioxide Oxygen DËi: Nitrogen e ̈vL ̈v: M ̈vm evZv‡m kZKiv cwigvY M ̈vm evZv‡m kZKiv cwigvY bvB‡Uav‡Rb (N2) 78.09% Aw·‡Rb (O2) 20.94% Kve©b-WvBA·vBW (CO2) 0.033% AvM©b (Ar) 0.80% Ab ̈vb ̈ 0.37% 6. f~c„ô †_‡K cvVv‡bv †eZvi Zi1⁄2, evqygÛ‡ji †Kvb ͇̄i evav †c‡q cybivq c„w_ex‡Z wd‡i Av‡m? [MAT 18-19] G‡·vwùqvi Av‡qv‡bvwùqvi g ̈vM‡b‡Uvwùqvi †g‡mvwùqvi DËi: Av‡qv‡bvwùqvi e ̈vL ̈v: evqygÛ‡ji 4_© ̄Íi Z_v _v‡g©vwùqv‡i (Zxea †m.i wewKi‡Yi X- ray Ges UV iwk¥i msNv‡Z) Gi wb¤œvs‡ki evqy AvqwbZ nq; d‡j G AÂj‡K Avq‡bvwùqvi e‡j| GLv‡b f~c„ô †_‡K cvVv‡bv †eZvi Zi1⁄2 euvav †c‡q cybivq c„w_ex‡Z wd‡i Av‡m| 7. evqygÛ‡ji †Kvb ͇̄i N~wY©S‡oi DrcwË nq? [DAT 19-20] Av‡qv‡bvwùqvi Ua‡cvwùqvi †g‡mvwùqvi ÷a ̈v‡Uvwùqvi DËi: Ua‡cvwùqvi e ̈vL ̈v: Ua‡cvwùqv‡i So, SÂv cÖf...wZ cÖvK...wZK wech©q N‡U _v‡K| cÖvq me ai‡bi wegvb G A‡jB PjvPj K‡i| ZvB G‡K ÿzä gÛj ejv nq| Aciw`‡K ÷a ̈v‡Uvwùqvi‡K kvšÍ gÛj ejv nq| G AÂj w`‡qB †RU wegvb PjvPj K‡i| 8. evqygЇji ÷a ̈v‡Uvwùqvi ͇̄ii g~j Dcv`vb †KvbwU? [DAT 19-20] Aw·‡Rb wbqb Kve©b WvBA·vBW I‡Rvb DËi: I‡Rvb e ̈vL ̈v: ÷a ̈v‡Uvwùqvi ͇̄i mvgvb ̈ bvB‡Uav‡Rb I Aw·‡Rb Dcw ̄ Z _vK‡jI g~j Dcv`vb I‡Rvb, hv m~h©iwk¥ †_‡K AvMZ iwk¥‡K †kvlY K‡i _v‡K| evqygЇj we` ̈gvb †gvU I‡Rvb M ̈v‡mi kZKiv 90 fvM G A‡j Aew ̄ Z| 9. f~-c„ô †_‡K Dc‡i †M‡j ZvcgvÎv KZ wWwMÖ †mjwmqvm K‡i K‡g hvq? [AFMC 20-21] 6.5 8 7 10 DËi: 7 e ̈vL ̈v: Ua‡cvwùqv‡i cÖwZ wK‡jvwgUvi D”PZvq ZvcgvÎv 7C nv‡i n«vm †c‡q 12 km D”PZvq cÖvq – 55C (ev, 218K) ch©šÍ nq|
2  Chemistry 2nd Paper Chapter-1 10. me‡P‡q †ewk cwigv‡Y I‡Rvb _v‡K †Kvb ͇̄i? [AFMC 20-21] Ua‡cvwùqvi _v‡g©vwùqvi †g‡mvwùqvi ÷a ̈v‡Uvwùqvi DËi: ÷a ̈v‡Uvwùqvi e ̈vL ̈v: ÷a ̈v‡Uvwùqv‡i O3 me‡P‡q †ewk cwigv‡Y _v‡K| 11. AvenvIqvi Rb ̈ ̧iæZ¡c~Y© †KvbwU? [AFMC 19-20] Ua‡cvwùqvi †g‡mvwùqvi _v‡g©vwùqvi GUgwùqvi DËi: Ua‡cvwùqvi 12. †Møvevj Iqvwg©s G cÖavb wMÖb nvDm M ̈vm †KvbwU? [AFMC 19-20] CO2, CFC CH4, CFC CO3 2– , CFC NH3, CFC DËi: CO2, CFC 13. evqy‡Z †Kvb wbw®Œq M ̈v‡mi cwigvY †ewk _v‡K? [CU-A 22-23; PUST 15-16] wμÞb wbqb †iWb AvM©b DËi: AvM©b e ̈vL ̈v: evqygЇji Dcv`vb: evqygЇji †MŠY Dcv`vbmg~n (%) AvM©b 0.80, 0.93 (nvRvix) He (0.15 – 1.5%) Kve©b WvB-A·vBW 0.033 wbw ̄Œq M ̈v‡mi g‡a ̈: evZv‡m AvM©‡bi (0.80%) cwigvY me‡P‡q †ewk 14. evqygЇji †Kvb A‡j H I He M ̈v‡mi cwigvY †ewk _v‡K? [JU-D 22-23] ÷a ̈v‡Uvwùqvi _v‡g©vwùqvi G‡·vwùqvi Ua‡cvwùqvi DËi: G‡·vwùqvi e ̈vL ̈v: _v‡gv©wùqv‡i G‡·vwùqvi bvgK AwaK ZvcgvÎvi Dc ̄Íi Av‡Q †hLv‡b H I He Gi cwigvY †ewk| 15. evqy‡Z N2O M ̈v‡mi evwl©K Mo e„w× KZ? [JU-D 22-23] 0.2 – 0.3% 0.5 – 0.9% 1 – 3% 0.02 – 0.1% DËi: 0.2 – 0.3% e ̈vL ̈v: evqy‡Z N2O M ̈v‡mi evwl©K Mo e„w× 0.2 – 0.3% 16. mvaviYZ mvB‡K¬vb •Zwi n‡Z mvM‡ii cvwbi ZvcgvÎv KZ nq? [JU-D 22-23] 27C 40C 52C 80C DËi: 27C e ̈vL ̈v: mvaviYZ mvM‡i mvB‡K¬vb •Zwi n‡Z cvwbi ZvcgvÎv 27C ev 80F ev 300K Gi †ewk n‡Z nq| 17. eZ©gv‡b evqy‡Z wg‡_b M ̈v‡mi NbgvÎv KZ? [JU-D 22-23] 1.7 ppm 2.8 ppm 3.1 ppm 1.5 ppm DËi: 1.7 ppm e ̈vL ̈v: evqyi ZvcgvÎv e„wׇZ CH4 Gi f~wgKv 19%| eZ©gv‡b evqygЇj CH4 Gi NbgvÎv 1.7 ppm Ges ZvcaviY ÿgZv CO2 Gi Zzjbvq 25 ̧Y †ewk| 18. hw` evqygÛ‡j CO2 I Rjxq ev®ú bv _vK‡Zv Z‡e c„w_ex c„ô I ZrmsjMœ evqygÛ‡ji Mo ZvcgvÎv KZ n‡Zv? [JU-D 22-23] 15C – 15C 30C – 30C DËi: – 30C e ̈vL ̈v: eZ©gv‡b c„w_exi Mo ZvcgvÎv 15C| hw` evqygÛ‡j CO2 I Rjxqev®ú bv _vK‡Zv Zvn‡j G ZvcgvÎv n‡Zv – 30C| 19. Rjxqev®ú‡K cvwb P‡μ cÖevngvb ivL‡Z c„w_exc„‡ô AvcwZZ m~h©iwk¥i kZKiv KZfvM e ̈wqZ nq? [JU-D 22-23] 23 42 34 50 DËi: 23 e ̈vL ̈v: c„w_ex‡Z AvcwZZ iwk¥i 34% cÖwZdwjZ nq| 42% evqygÛj, ̄ jfvM, mgy`a KZ...©K †kvwlZ nq, cvwbP‡μ cÖevn ivL‡Z 23% Ges 1% mv‡jvKms‡kølY I Ab ̈vb ̈ Kv‡R jv‡M| 20. evqygЇji M ̈vmxq c`v‡_©i †gvU fi KZ? [JU-D 22-23] 5.0  1018 kg 5.0  1018 kg 5.0  1016 kg 5.0  1016 ton DËi: 5.0  1018 kg e ̈vL ̈v: evqygÛ‡j M ̈vmxq c`v‡_©i †gvU fi = 5  1018 kg = 5  1015 ton 21. weÁvbx‡`i aviYv g‡Z, •ewk^K Dòvq‡bi Rb ̈ 2050 mv‡ji w`‡K kZKiv KZ fvM cÖRvcwZ wejyß n‡Z cv‡i? [JU-D 22-23] 44 34 23 42 DËi: 23 e ̈vL ̈v: •ewk^K Dòvq‡bi d‡j 2050 mv‡ji g‡a ̈ 44% ̄Íb ̈cvqx, 23% cÖRvcwZ wejyß n‡e| 22. Ua‡cvwùqv‡ii 12 km D”PZvq ZvcgvÎv KZ? [JU-D 22-23] 250 K 240 K 230 K 218 K DËi: 218 K e ̈vL ̈v: 12 km D”PZvq ZvcgvÎv 15C †_‡K K‡g – 55C ev 218 K nq|
cwi‡ek imvqb  Varsity Practice Sheet 3 23. cwi‡ek weÁvbx‡`i aviYv g‡Z c„w_exi Mo ZvcgvÎv 2050 mv‡ji w`‡K KZ n‡Z cv‡i? [JU-D 22-23] 18C 22C 19C 20C DËi: 18C e ̈vL ̈v: eZ©gvb nv‡i CO2 e„w× †c‡j weÁvbx‡`i g‡Z 2050 mv‡j c„w_exi Mo ZvcgvÎv 15C †_‡K 3C †e‡o 18C n‡e| 24. evqygÛ‡ji †Kvb AÂj‡K ÿzä gÛj e‡j? [JU-D 22-23, 21-22] Ua‡cvwùqvi ÷av‡Uvwùqvi Ua‡cvcvDR †g‡mvcvDm DËi: Ua‡cvwùqvi e ̈vL ̈v: Ua‡cvwùqvi: evqygЇji AÂj cwimi (km) Dcw ̄’Z Dcv`vb •ewkó ̈ Ua‡cvwùqvi 0 – 15 N2, O2, CO2, Ar, H2O  ÿzä gÐj  AvenvIqv I Rjevqy wbqš¿Y  wegvb PjvPj 25. eZ©gv‡b Ua‡cvwùqv‡ii evqy‡Z wewfbœ ̄’v‡b O3 M ̈v‡mi evwl©K Mo e„w×i nvi KZ? [JU-D 22-23] 1 – 2% 0.2 – 0.3% 0.1 – 0.3% 0.4 – 1.0% DËi: 0.4 – 1.0% e ̈vL ̈v: wMÖbnvDR cÖfve m„wó‡Z CFC Gi f~wgKv cÖvq 16%|  O3 Gi Zvc aviY ÿgZv CO2 Gi †P‡q 10 ̧Y †ewk|  Ua‡cvwùqv‡ii eû ̄ v‡b O3 M ̈v‡mi eQ‡i Mo e„w×i nvi 0.4 – 1% 26. f~-c„‡ôi Dci evqygÛ‡ji Pvc cÖwZ eM© Bw‡Z KZ? [JU-D 22-23] 14.7 cvDÛ 1.033 cvDÛ 17.2 cvDÛ 17.8 cvDÛ DËi: 14.7 cvDÛ e ̈vL ̈v: evqygÛ‡ji †gvU M ̈vmxq c`v‡_©i fi 5.5  Ub, hv c„w_exi †gvU IR‡bi `k jÿ fv‡Mi GK fvM Ges Pvc cÖwZ 6 eM© †mw›UwgUv‡i 7 kg (cÖwZ eM© Bw‡Z 14.7 cvDÛ)| 27. evqygÛ‡ji †Kvb A‡j UV-iwk¥i cÖfv‡e M ̈vmxq AYyi we‡hvRb I B‡jKUab ̄’vbvšÍ‡ii d‡j abvZ¥K Avqb, cigvYy I AYyi wgkÖY Drcbœ nq? [JU-D 22-23] _v‡g©vwùqvi †g‡mvwùqvi Ua‡cvcvDR kvšÍgÛj DËi: _v‡g©vwùqvi e ̈vL ̈v: _v‡g©vwùqv‡i Av‡jv kw3i †hgb D”Pkw3m¤úbœ UV-iwk¥i cÖfv‡e M ̈vmxq AYyi we‡qvRb I B‡jKUab ̄ vbvšÍ‡ii d‡j wewfbœ abvZ¥K Avqb, cigvYy I AYyi wgkÖY _v‡K| ZvB G AÂj‡K Av‡qv‡bvwùqviI e‡j| GLv‡b wewfbœ abvZ¥K Avqb †hgb: N + 2 , O+ 2 , O+ , NO+ , H+ , He+ BZ ̈vw` _v‡K| 28. GKwU AÜKvi N‡i miæ wQ`a w`‡q m~‡h©i Av‡jv cÖ‡ek Ki‡j Av‡jvK iwk¥i g‡a ̈ AmsL ̈ ÿz`a ÿz`a D3⁄4¡j Av‡jvK we›`y †`Lv hvq| Giƒc Av‡jvK we›`y m„wói KviY bq †KvbwU? [RU-C 21-22] a~wjKYvi mvBR 2 nm – 500 nm Gi g‡a ̈ _v‡K wUÛvj cÖfve evqy I a~wjKYvi mgmË¡ wgkÖY a~wjKYvi eavDbxq MwZ DËi: evqy I a~wjKYvi mgmË¡ wgkÖY 29. Which is the topmost layer of atmosphere? [IUT 21-22] Exosphere lonosphere Thermosphere None of these DËi: Exosphere 30. Which region of atmosphere does contain Ozone layer? [IUT 10-11] Troposphere Themosphere Mesosphere Stratosphere DËi: Stratosphere M ̈v‡mi m~Î (e‡qj, Pvj©m I A ̈v‡fvMv‡Wav) 31. – 273C ZvcgvÎvq N2 M ̈v‡mi †gvjvi AvqZb dm3 G KZ? [DU 21-22] 0 6.023 22.4 48.789 DËi: 0 e ̈vL ̈v: – 273C ZvcgvÎvq †Kv‡bv M ̈v‡mi AvqZb 0 dm3 Vt = V0      1 + t 273  V–273 = V0      1 – 273 273 = V0(1 – 1) = 0 dm3 32. GKwU Av`k© M ̈v‡mi Rb ̈ PV ebvg 1 P †jLwPÎ n‡e GKwUÑ [DU-A 21-22] †Q`Kmn mij‡iLv Awae„Ë X-A‡ÿi mgvšÍivj mij‡iLv g~jwe›`yMvgx mij‡iLv DËi: X-A‡ÿi mgvšÍivj mij‡iLv e ̈vL ̈v: PV ebvg 1 P Gi †jLwPÎ: PV 1 P
4  Chemistry 2nd Paper Chapter-1 33. cÖgvY ZvcgvÎv I Pv‡c (STP) †Kvb M ̈v‡mi 1.0 MÖvg me‡P‡q †ewk AvqZb `Lj K‡i? [DU 18-19] N2 H2 O2 Ar DËi: H2 e ̈vL ̈v: A ̈v‡fv‡M‡Wavi m~Î g‡Z, V  n [P I T w ̄ i] myZivs, 1 g H2 me‡P‡q †ewk AvqZb `Lj Ki‡e| 34. †Kvb †jLwPÎwU w ̄’i Pv‡c Pvj©‡mi m~‡Îi mv‡_ msMwZc~Y©? [DU 14-15] T(K) V(L) T(K) V(L) T(K) V(L) T(K) V(L) DËi: T(K) V(L) e ̈vL ̈v: Pvj©‡mi m~Îvbymv‡i, V  T ev, V = KT. mgxKiYwU‡K y = mx Gi mv‡_ Zzjbv Ki‡j g~jwe›`yMvgx mij‡iLv cvIqv hvq| tC G Pvj©m Gi m~Î : V = V0 + V0 × t 273 Pvj©m Gi m~‡Îi †jLwPÎ : T (K) V ebvg T V t (C) V ebvg tC V V0 35. 101.3 kPa evwn ̈K Pv‡c cvwbi ùzUbv1⁄4 KZ? [DU 11-12] 120.8C 90.5C 100.0C 18.0C DËi: 100.0C e ̈vL ̈v: ̄^vfvweK Ae ̄ vq cvwbi Mjbv1⁄4 0C Ges cvwbi ùzUbv1⁄4 100C hv Kÿ ZvcgvÎvi †P‡q †ewk Ges Mjbv1⁄4 (0C) KÿZvcgvÎv A‡cÿv Kg nIqvq cvwb Kÿ ZvcgvÎvq Zij c`v_©| 36. 13C ZvcgvÎvq wbw`©ó f‡ii GKwU Av`k© M ̈v‡mi AvqZb w ̄’i Pv‡c wØ ̧Y Kiv nj| GB Ae ̄’vq M ̈vmwUi ZvcgvÎv KZ n‡e? [DU 08-09] 7.5C 299C 13C 26C DËi: 299C e ̈vL ̈v: V  T  T = 2T0 = 2 × (273 + 13) = 572 K = 299C 37. Pvc w ̄’i †i‡L GKwU M ̈v‡mi (AvqZb 1000 cm3 ) ZvcgvÎv A‡a©K Kiv nj| cwiewZ©Z Ae ̄’vq Dnvi AvqZb KZ n‡e? [DU 06-07] 2000 cm3 500 cm3 1000 cm3 1500 cm3 DËi: 500 cm3 e ̈vL ̈v: w ̄ i Pv‡c †h †Kvb M ̈v‡mi AvqZb Dnvi cig ZvcgvÎvi mgvbycvwZK A_©vr V  T| d‡j ZvcgvÎv A‡a©K n‡j M ̈v‡mi AvqZbI A‡a©K n‡e|  V = 1 2 V0 = 1 2 × 1000 = 500 cm3 38. †Kv‡bv wbw`©ó AvqZ‡bi M ̈v‡mi ZvcgvÎv 0C. AvqZb w ̄’i †i‡L M ̈vmwU‡K DËß Kivq Zvi Pvc Pvi ̧Y e„w× †cj| H M ̈vmwUi ZvcgvÎv KZ e„w× †cj? [DU 99-00] 850 800 810 819 DËi: 819 e ̈vL ̈v: P  T GLv‡b, P = 4P0  T = 4T0 = 4 × 273 = 1092 K = 819C 39. STP †Z GKwU M ̈v‡mi AvqZb 150 cm3 | GKB ZvcgvÎvq D3 M ̈v‡mi Pvc A‡a©K Ki‡j AvqZb KZ n‡e? [DU 95-96] 75 cm3 150 cm3 225 cm3 300 cm3 DËi: 300 cm3 e ̈vL ̈v: V = 2V0 = 2 × 150 = 300 cm3 w ̄ i ZvcgvÎvq Pvc A‡a©K Ki‡j AvqZb wØ ̧Y n‡e| 40. 38.5C ZvcgvÎvq M ̈vm wmwjÛv‡ii Pvc 6 atm. Zv Av ̧‡b wb‡ÿc Ki‡j 350C ZvcgvÎvq wmwjÛviwU we‡ùvwiZ nq| GwU m‡e©v”P KZ Pvc mn ̈ K‡i? [BUET 21-22] 4 atm 6 atm 8 atm None DËi: None e ̈vL ̈v: P1 P2 = T1 T2  P2 = T2 T1 × P1 = (350 + 273) (38.5 + 273) × 6 = 12 atm 41. T ZvcgvÎv I P Pv‡c V AvqZ‡bi GKwU wgkÖY‡K mgAvqZb A_©vr v AvqZ‡bi Aci GKwU wgkÖ‡Yi mv‡_ wgwkÖZ Kiv n‡j hvi ZvcgvÎv I Pvc c~‡e©iwUi g‡ZvB h_vμ‡g T I P; T ZvcgvÎvi AvqZb V wVK ivLv n‡j wgkÖ‡Yi Pvc KZ n‡e? [BUET 20-21; KUET 16-17] P/2 P 2 P 2P DËi: 2P e ̈vL ̈v: PV = PV + PV  P = 2P
cwi‡ek imvqb  Varsity Practice Sheet 5 42. wb‡¤œi †Kvb m~ÎwU Av`k© M ̈v‡mi Rb ̈ ̧iæZ¡c~Y© bq? [BUET 13-14] Gay-Lussac’s law Raoult’s law Graham’s law Avogadrow’s law DËi: Raoult’s law e ̈vL ̈v: Av`k© M ̈v‡mi m~Îmg~n : m~Î eY©bv Gay-Lussac’s law M ̈v‡mi AvqZb AbycvZ m~Î Raoult’s law Av`k© Zij-Zj `ae‡Yi m~Î Graham’s law e ̈vcb m~Î Avogadrow’s law AYyi aviYvi m~Î 43. cig k~b ̈ ZvcgvÎvqÑ [BUET 13-14] Zvc cÖ‡qv‡M M ̈v‡mi AvqZb e„w× cvq Pvc cÖ‡qv‡M M ̈v‡mi AvqZb n«vm cvq M ̈v‡mi AvqZb k~b ̈ nq †M-jymv‡Ki m~Î AKvh©Ki n‡q hvq DËi: M ̈v‡mi AvqZb k~b ̈ nq e ̈vL ̈v: Pvj©‡mi m~Îvbyhvqx, cigk~b ̈ ZvcgvÎv –273C ev, 0 K G †Kvb M ̈v‡mi AvqZb k~b ̈ nq| 44. cÖgvY ZvcgvÎv I Pv‡c wb‡Pi †Kvb M ̈vmwUi †gvjvi AvqZb me‡P‡q †ewk? [BUET 12-13] H2 He N2 †KvbwUB bq DËi: †KvbwUB bq e ̈vL ̈v: A ̈v‡fv‡M‡Wav cÖKí Abymv‡i GKB ZvcgvÎv I Pv‡c me M ̈v‡mi †gvjvi AvqZb mgvb| 45. V = k 1 P mgxKiY Øviv †Kvb m~Î cÖKvk Kiv nq?[BUET 10-11] A ̈v‡fv‡M‡Wavi m~Î †M-jymv‡Ki m~Î Wvë‡bi m~Î None of these DËi: None of these e ̈vL ̈v: V = k 1 P ev, V  1 P ; w ̄ i ZvcgvÎvq †Kvb M ̈v‡mi AvqZb cÖhy3 Pv‡ci e ̈ ̄ÍvbycvwZK| GwU e‡q‡ji m~Î| 46. 3.5 g/cm3 NbZ¡ Ges 18.9 g f‡ii GK LÛ cv_i 100 mL gvc‡Pv‡O 50 mL cvwbi g‡a ̈ †d‡j †`qv n‡jv| †Pv‡Oi g‡a ̈ cvwbi AvqZb KZ n‡e? [BUET 09-10] 44.6 mL 72.4 mL 55.4 mL 68.9 mL DËi: 55.4 mL e ̈vL ̈v: V = M  = 18.9 3.5 = 5.4 cm3  †gvU V = (50 + 5.4) = 55.4 mL 47. ev ̄Íe M ̈vm e‡q‡ji m~Î †g‡b P‡jÑ [MAT 15-16] wb¤œ ZvcgvÎvq 0C ZvcgvÎvq Kÿ ZvcgvÎvq Lye D”P ZvcgvÎvq DËi: Lye D”P ZvcgvÎvq e ̈vL ̈v: wb¤œPv‡c †hgbÑ 1 atm Pvc ev Zvi wb‡P Ges D”P ZvcgvÎvq ev ̄Íe M ̈vmmg~n †gvUvgywU Av`k© M ̈v‡mi b ̈vq AvPiY K‡i| 48. 27C ZvcgvÎvq 300 mL cwigvY GKwU M ̈vm‡K GKB Pv‡c †i‡L 7C ZvcgvÎvq wb‡q Avmv n‡j Bnvi AvqZb n‡eÑ [MAT 15-16] 280 mL 540 mL 350 mL 135 mL DËi: 280 mL e ̈vL ̈v: V1 T1 = V2 T2  300 300 = V2 280  V2 = 280 mL 49. cvwb‡K 0C ZvcgvÎv n‡Z 10C ZvcgvÎvq DËß Ki‡j Dnvi AvqZbÑ [MAT 14-15] e„w× cvq K‡g AcwiewZ©Z _v‡K cÖ_‡g ev‡o Zvici K‡g DËi: e„w× cvq e ̈vL ̈v: V  T A_©vr ZvcgvÎv evo‡j AvqZb ev‡o| 50. w ̄’i ZvcgvÎvq I 1 atm Pv‡c †Kvb wbw`©ó f‡ii Aw·‡Rb M ̈v‡mi AvqZb 3.15 L nq| H Aw·‡Rb M ̈v‡mi Pvc e„w× K‡i 2.50 atm Kiv n‡j, ZLb H M ̈v‡mi AvqZb KZ? [MAT 05-06] 2.16 1.26 1.62 6.21 DËi: 1.26 e ̈vL ̈v: P1V1 = P2V2  1 × 3.15 = 2.50 × V2  V2 = 1.26 51. PV = K GB mgxKiYwU mvaviYfv‡e †Kvb m~‡Îi cÖKvkÑ [MAT 02-03] Pvj©‡mi m~Î e‡q‡ji m~Î Pv‡ci m~Î Av`k© M ̈vm mgxKiY DËi: e‡q‡ji m~Î e ̈vL ̈v: PV = K GB mgxKiYwU e‡q‡ji m~‡Îi cÖKvk| 52. GKwU d¬v‡· 10 atm Pv‡c 50 L nvB‡Wav‡Rb fwZ© Kiv Av‡Q| 2 L AvqZb wewkó KZwU †ejyb‡K H M ̈vm Øviv fwZ© Kiv hv‡e; hLb cÖwZwU †ejyb Gi wfZi nvB‡Wav‡Rb M ̈v‡mi Pvc 2 atm n‡e? [cÖwZ †ÿ‡Î M ̈v‡mi ZvcgvÎv w ̄’i Av‡Q] [MAT 01-02] 105 wU †ejyb 90 wU †ejyb 120 wU †ejyb 125 wU †ejyb DËi: 125 wU †ejyb e ̈vL ̈v: awi, †ejy‡bi msL ̈v = x wU, 1 wU †ejy‡bi AvqZb = 2L  x msL ̈K †ejy‡bi AvqZb = 2x L m~Îvbymv‡i, P1V1 = P2V2  10 × 50 = 2 × 2x  x = 10 × 50 2 × 2 = 125  †ejy‡bi msL ̈v = 125 wU|