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Cu 1: in phn 1 mui clorua kim loi kim nng chy thu c 0,896 lt Cl2 (kc) anot v 3,12 gam kim loi catot. Cng thc mui l: A. NaCl B. KCl C. LiCl D. RbCl

Cu 2: in phn mui clorua kim loi trng thi nng chy, sau thi gian ta thy catot c 2,74 gam kim loi v anot c 448 ml kh (ktc). Cng thc mui clorua l: A. CaCl2 B. NaCl C. KCl D. BaCl2

Cu 3: in phn nng chy mui clorua ca kim loi M, anot thu c 1,568 lit kh (ktc), khi lng kim loi thu c catot l 2,8 gam. Kim loi M l: A. Mg B. Na C. K D. Ca

Cu 4: Cho dng in mt chiu c cng 16A i qua nhm oxit nng chy trong 3 gi. Khi lng Al thot ra catot l: A. 8,0 gam B. 91,3 gam C. 46,0 gam D. 16,1 gam

Cu 5: in phn nng chy Al2O3 vi anot than ch (hiu sut in phn 100%) thu c m kg Al catot v 67,2 m

3 ( ktc) hn hp kh X c t khi so vi hiro bng 16. Ly 2,24 lt ( ktc) hn hp kh X sc

vo dung dch nc vi trong (d) thu c 2 gam kt ta. Gi tr ca m l: A. 108,0. B. 75,6. C. 54,0. D. 67,5.

(Trch thi tuyn sinh H C khi B 2009) Cu 6: in phn dung dch NaOH vi cng dng in l 10A trong thi gian 268 gi. Sau khi in phn cn li 100 gam dung dch NaOH c nng 24%. Nng % ca dung dch NaOH trc khi in phn l:

A. 4,2% B. 2,4% C. 1,4% D. 4,8%

Cu 7: Cho dng in i qua bnh in phn cha 500 ml dung dch natri hiroxit c nng ca NaOH l 4,6% (khi lng ring 1,05 g/ml). Sau mt thi gian, nng ca natri hiroxit trong bnh in phn t n 10%. Th tch cc kh (ktc) thot ra in cc l: A. 337,9 lit H2 v 177,4 lit O2 B. 177,4 lit H2 v 337168, 9 lit O2

C. 168, 9 lit H2 v 177,4 lit O2 D. 177,4 lit H2 v 337,9 lit O2

Cu 8: Cho 1 lit dung dch CuCl2 0,1M. in phn vi cng 10A trong vng 2895s. Khi lng Cu thot ra l:

A. 6,4 gam B. 3,2 gam C. 9, 6 gam D. 4,8 gam

Cu 9: in phn 300 ml dung dch CuSO4 0,2M vi cng dng in l 3,86A. Khi lng kim loi thu c catot sau khi in phn 20 pht l (cho Cu = 64; S = 32; O = 16): A. 1,28 gam B. 1,536 gam C. 1,92 gam D. 3,84 gam

Cu 10: in phn 1 lit dung dch AgNO3 vi in cc tr, dung dch sau in phn c pH = 2. Coi th tch dung dch sau in phn khng thay i. Khi lng bc bm catot l: A. 2,16 gam B. 1,08 gam C. 0,108 gam D. 0,54 gam

Cu 11: in phn 100 ml dung dch CuSO4 0,2M vi cng dng in I = 9,65A. Khi lng Cu bm trn catot khi thi gian in phn t1 = 200s v t2 = 500s ln lt l: A. 0,32 gam; 0,64 gam B. 0,32 gam; 1,28 gam

C. 0,64 gam; 1,28 gam D. 0,64 gam; 1,32 gam

Cu 12: in phn 400 ml dung dch CuSO4 0,2M vi cng dng in I = 10A trong thi gian t, ta thy c 224 ml kh (ktc) thot ra anot. Gi thit rng in cc tr v hiu sut l 100%. Khi lng ca catot tng ln l: A. 1,28 gam B. 0,75 gam C. 2,5 gam D. 3,1 gam

Cu 13: in phn in cc tr 200 ml dung dch Cu(NO3)2 n khi bt u c bt kh thot ra catot th dng, yn dung dch n khi khi lng catot khng i thy khi lng so vi khi lng lc u tng 3,2 gam. Nng mol ca dung dch Cu(NO3)2 ban u khi cha in phn l: A. 0,5M B. 0,25M C. 0,35M D. 0,4M

Cu 14: in phn n ht 0,1 mol Cu(NO3)2 trong dung dch vi in cc tr, th sau in phn khi lng dung dch gim l: A. 1,6 gam B. 6,4 gam. C. 8,0 gam D. 18,8 gam



Cu 15: in phn 400 gam dung dch ng (II) sunfat 8% cho n khi khi lng ca dung dch gim bt 20,5 gam. Nng % ca hp cht trong dung dch khi dng in phn l: A. 2,59% B. 3,36% C. 1,68% D. 5,18%

Cu 16: in phn 400 gam dung dch bc nitrat 8,5% cho n khi khi lng ca dung dch gim bt 25 gam. Nng phn trm ca cht tan trong dung dch sau khi ngng in phn l: A. 4,48% B. 6,72% C. 3,36% D. 1,12%

Cu 17: in phn 400 ml dung dch CuSO4 0,2M vi cng dng in I = 10A trong thi gian t, ta thy c 224 ml kh (ktc) thot ra anot. Gi thit rng in cc tr v hiu sut l 100%. Thi gian in phn l:

A. 6 pht 26 giy B. 3 pht 10 giy C. 7 pht 20 giy D. 5 pht 12 giy

Cu 18: in phn 100 ml dung dch CuSO4 0,12M sau thi gian l 200s thu c 0,384 gam Cu catot. Nu tip tc in phn vi cng dng in gp 2 ln cng dng in ca th nghim trn th thi gian catot bt u si bt l: A. 150s B. 200s C.180s D. 100s

Cu 19: in phn 100 ml dung dch CuSO4 0,1M cho n khi va bt u si bt bn catot th ngng in phn (H% = 100%). Th tch dung dch c xem nh khng thay i. Gi tr ca pH dung dch l: A. 1,0 B. 0,7 C. 2,0 D. 1,3

Cu 20: Ho tan 1,28 gam CuSO4 vo nc ri em in phn ti hon ton, sau mt thi gian thu c 800 ml dung dch c pH = 2. Hiu sut ca phn ng in phn l: A. 62,5% B. 50% C. 75% D. 80%

Cu 21: in phn 400 ml dung dch CuSO4 0,2M vi cng dng in I = 10A trong thi gian t, ta thy c 224 ml kh (ktc) thot ra anot. Gi thit rng in cc tr v hiu sut l 100%. Nu th tch dung dch thay i khng ng k th nng ca ion H+ trong dung dch sau in phn l: A. 0,1M B. 0,3M C. 0,4M D. 0,02M

Cu 22: in phn 200 ml dung dch CuSO4 nng a mol/l n khi dung dch vn cn mu xanh thy khi lng dung dch gim 0,8 gam. Cho 1,68 gam Fe vo dung dch thu c sau in phn, sau khi phn ng xy ra hon ton thu c 1,2 gam kim loi. Gi tr a l: A. 0,2M B. 0,1M C. 0,15M D. 0,25M

Cu 23: in phn dung dch AgNO3 mt thi gian thu c dung dch A v 0,672 lit kh anot ( ktc). Cho 5,32 gam Fe vo dung dch A thu c V lit kh khng mu ha nu ngoi khng kh ( ktc) dung dch B (ch cha mt mui) cht rn C (ch cha mt kim loi). Hiu sut ca qu trnh in phn v gi tr V l:

A. 25% v 0,672 lit B. 20% v 0,336 lit C. 80% v 0,336 lit D. 85% v 8,96 lit

Cu 24: Sau khi in phn 200 ml dung dch CuSO4 (d = 1,25 g/ml), khi lng dung dch gim i 8 gam. Mt khc, lm kt ta ht lng CuSO4 cha b in phn phi dng ht 1,12 lt H2S (ktc). Nng % v nng mol ca dung dch CuSO4 trc khi in phn l: A. 9,6% v 0,75M. B. 16% v 0,75M. C. 19,2% v 0,75M. D. 9,6% v 0,50M

Cu 25: in phn 500 ml dung dch CuSO4 vi cng dng in khng i th sau 600s, nc bt u b in phn c 2 in cc. Nu thi gian in phn l 300s th khi lng Cu bm trn catot l 3,2 gam. Nng mol ca dung dch CuSO4 trong dung dch ban u v cng dng in ln lt l: A. 0,1M; 16,08A B. 0,25M; 16,08A C. 0,12M; 32,17A D. 0,2M; 32,17A

Cu 26: Ho tan 13,68 gam mui MSO4 vo nc c dung dch X. in phn X (vi in cc tr, cng dng in khng i) trong thi gian t giy, c y gam kim loi M duy nht catot v 0,035 mol kh anot. Cn nu thi gian in phn l 2t giy th tng s mol kh thu c c hai in cc l 0,1245 mol. Gi tr ca y l: A. 3,920. B. 4,788. C. 4,480. D. 1,680.

(Trch thi tuyn sinh H C khi A 2011) Cu 27: in phn 1 lit dung dch Cu(NO3)2 0,2M n khi catot bt u c kh thot ra th dng li, thu c dung dch A. Dung dch A c th ha tan c ti a bao nhiu gam Fe? ( bit rng c kh NO duy nht thot ra ngoi) A. 8,4 gam B. 4,8 gam C. 5,6 gam D. 11,2 gam

Cu 28: in phn (dng in cc tr) dung dch mui sunfat ca kim loi ho tr II vi cng dng in 3A. Sau 1930 giy thy khi lng catot tng 1,92 gam. Cng thc ca mui sunfat b in phn l:



A. CuSO4 B. FeSO4 C. MgSO4 D. NiSO4 Cu 29: in phn mt dung dch mui nitrat ca mt kim loi M ha tr n vi cng dng I = 9,65A, thi gian in phn 400 giy th thy khi lng catot tng 4,32 gam. Kim loi M l: A. Cu B. Ag C. Fe D. Zn

Cu 30: in phn dung dch mt mui nitrat kim loi vi hiu sut 100%, cng dng in khng i 7,72A trong thi gian 9 pht 22,5 giy. Sau khi kt thc khi lng catot tng ln 4,86 gam do kim loi bm vo. Kim loi l: A. Cu B. Hg C. Ag D. Pb

Cu 31: in phn (in cc tr) dung dch cha 0,02 mol NiSO4 vi cng dng in 5A trong 6 pht 26 giy. Khi lng catot tng ln bng: A. 0,00 gam B. 0,16 gam C. 0,59 gam D. 1,18 gam

Cu 32: Ho tan 40 gam mui CdSO4 b m vo nc. in phn ht caimi trong dung dch cn dng dng in 2,144A v thi gian 4 gi. Phn trm nc cha trong mui l: A. 18,4% B. 16,8% C. 18,6% D. 16%

Cu 33: Th tch kh (ktc) thu c khi in phn ht 0,1 mol NaCl trong dung dch vi in cc tr, mng ngn xp l: A. 0,224 lt B. 1,120 lt C. 2,240 lt D. 4,489 lt

Cu 34: Khi in phn dung dch canxi clorua, catot thot ra 4 gam hiro v V lit kh thot ra anot. Khi lng kh thot ra l: A. 32 gam B. 142 gam C. 19 gam D. 64 gam

Cu 35: in phn 100 ml dung dch NaCl vi in cc tr, c mng ngn xp, cng dng in I = 1,93A. Dung dch sau in phn c pH = 12 (coi th tch dung dch khng i v hiu sut in phn l 100%). Thi gian in phn l: A. 100s B. 150s C. 50s D. 200s

Cu 36: in phn 1 lit dung dch NaCl d vi in cc tr, mng ngn xp ti khi dung dch thu c c pH = 12 (coi lng Cl2 tan trong H2O khng ng k, th tch dung dch thay i khng ng k), th th tch kh thot ra anot ( ktc) l: A. 0,336 lit B. 0,112 lit C. 0,224 lit D. 1,12 lit

Cu 37: Ha tan 11,7 gam NaCl vo nc ri em in phn c mng ngn, thu c 500 ml dung dch c pH = 13. Hiu sut in phn l: A. 50% B. 20% C. 56.8% D. 40,6%

Cu 38: Khi in phn 1 lt dung dch NaCl (d = 1,2 g/ml). Trong qu trnh in phn ch thu c 1 cht kh in cc. Sau khi qu trnh in phn kt thc, ly dung dch cn li trong bnh in phn c cn cho ht hi nc thu c 125 gam cht rn khan. em cht rn nhit phn th thy khi lng gim i 8 gam. Hiu sut qu trnh in phn l: A. 46,8% B. 20,3% C. 56,8% D. 28,4%

Cu 39: in phn c mng ngn, in cc tr 100 ml dung dch MgCl2 0,15 M vi I = 0,1A trong thi gian l 9650 giy. Nng mol cc ion trong dung dch sau in phn l: A. 0,1M v 0,15M B. 0,1M v 0,2M C. 0,15M v 0,2M D. 0,15M v 0,25M

Cu 40: in phn (in cc tr) dung dch CuCl2 vi cng dng in 4A. Sau 3860 giy in phn khi lng catot tng: A. 10,24 gam. B. 2,56 gam. C. 7,68 gam. D. 5,12 gam

Cu 41: in phn 100 ml dung dch CuCl2 0,08M. Cho dung dch sau in phn tc dng vi AgNO3 d thu c 0,861 gam kt ta. Khi lng Cu bm trn catot v th tch kh Cl2 thu c trn anot l: A. 0,16 gam; 0,56 lit Cl2 B. 0,64 gam; 0,112 lit Cl2

C. 0,64 gam; 0,224 lit Cl2 D. 0,32 gam; 0,112 lit Cl2

Cu 42: in phn dung dch CuCl2 vi in cc tr, sau mt thi gian thu c 0,32 gam Cu catot v mt lng kh X anot. Hp th hon ton lng kh X ni trn vo 200 ml dung dch NaOH ( nhit thng). Sau phn ng, nng NaOH cn li l 0,05M (gi thit th tch dung dch khng thay i). Nng ban u ca dung dch NaOH l: A. 0,15M B. 0,2M C. 0,1M D. 0,05M

(Trch thi tuyn sinh H C khi A 2007) Cu 43: in phn dung dch cha a mol CuSO4 v b mol NaCl (vi in cc tr, mng ngn xp). dung dch sau in phn lm phenolphtalein chuyn sang mu hng th iu kin ca a v b l:



A. 2b = a B. b < 2a C. b = 2a D. b > 2a

(Trch thi tuyn sinh H C khi B 2007) Cu 44: Thc hin phn ng in phn dung dch cha m gam hn hp CuSO4 v NaCl vi cng dng in l 5A. n thi im t, ti 2 in cc nc bt u in phn th ngt dng in. Dung dch sau in phn ho tan va 1,6 gam CuO v anot ca bnh in phn c 448 ml kh bay ra (ktc). Khi lng hn hp 2 mui NaCl v CuSO4 l: A. 3,785 gam B. 5,785 gam C. 4,8 gam D. 5,97 gam

Cu 45: Thc hin phn ng in phn dung dch cha mg hn hp CuSO4 v NaCl vi cng dng in l 5A. n thi im t, ti 2 in cc nc bt u in phn th ngt dng in. Dung dch sau in phn ho tan va 1,6 gam CuO v anot ca bnh in phn c 448 ml kh bay ra (ktc). Khi lng dung dch gim do phn ng in phn l: A. 3,59 gam B. 3,15 gam C. 1,295 gam D. 2,95 gam

Cu 46: Thc hin phn ng in phn dung dch cha mg hn hp CuSO4 v NaCl vi cng dng in l 5A. n thi im t, ti 2 in cc nc bt u in phn th ngt dng in. Dung dch sau in phn ho tan va 1,6 gam CuO v anot ca bnh in phn c 448 ml kh bay ra (ktc). Nu th tch dung dch khng thay i V = 500 ml th nng mol ca cc cht trong dung dch l: A. 0,04M; 0,08M B. 0,12M; 0,04M C. 0,3M; 0,05M D. 0,02M; 0,12M

Cu 47: Thc hin phn ng in phn dung dch cha mg hn hp CuSO4 v NaCl vi cng dng in l 5A. n thi im t, ti 2 in cc nc bt u in phn th ngt dng in. Dung dch sau in phn ho tan va 1,6 gam CuO v anot ca bnh in phn c 448 ml kh bay ra (ktc).Thi gian in phn l:

A. 19 pht 6 giy B. 18 pht 16 giy C. 9 pht 8 giy D. 19 pht 18 giy

Cu 48: in phn dung dch cha x mol CuSO4 v 0,2 mol NaCl. Kt thc in phn thu c dung dch X c kh nng ha tan ht 1,02 gam Al2O3. Gi tr ca x l: A. 0,09 hoc 0,1. B. 0,09 hoc 0,13. C. 0,02 hoc 0,1. D. 0,02 hoc 0,13. Cu 49: in phn 2 bnh in phn mc ni tip. Bnh 1 cha 100 ml dung dch CuSO4 0,1M, bnh 2 cha 100 ml dung dch NaCl 0,1M. Ngng in phn khi dung dch thu c trong bnh 2 c pH = 13. Nng ion Cu2+ cn li trong bnh 1 (th tch dung dch coi nh khng i) l: A. 0,04M B. 0,1M C. 0,08M D. 0,05M

Cu 50: in phn dung dch gm 7,45 gam KCl v 28,2 gam Cu(NO3)2 (in cc tr, mng ngn xp) n khi khi lng dung dch gim i 10,75 gam th ngng in phn (gi thit lng nc bay hi khng ng k). Tt c cc cht tan trong dung dch sau in phn l: A. KNO3 v KOH. B. KNO3, HNO3 v Cu(NO3)2.

C. KNO3, KCl v KOH. D. KNO3 v Cu(NO3)2.

(Trch thi tuyn sinh H C khi A 2011) Cu 51: Trong bnh in phn in cc tr cha 200 ml dung dch AgNO3 0,2M v Cu(NO3)2 0,2M. ng mch in vi I = 5A, hiu sut in phn 100%. Sau 19 pht 18 giy ta ngt dng in. Khi lng kim loi bm vo catot l: A. 4,96 gam B. 1,08 gam C. 2,8 gam D. 3,55 gam

Cu 52: Tin hnh in phn hon ton dung dch X cha AgNO3 v Cu(NO3)2 thu c 56 gam hn hp kim loi catot v 4,48 lit kh anot (ktc). S mol AgNO3 v Cu(NO3)2 trong X ln lt l: A. 0,2 v 0,3 B. 0,3 v 0,4 C. 0,4 v 0,3 D. 0,4 v 0,2

Cu 53: in phn 200 ml mt dung dch c ho tan Cu(NO3)2 v AgNO3 vi cng dng in l 0,804A, n khi bt kh bt u thot ra cc m th mt thi gian l 2 gi, khi khi lng cc m tng 3,44 gam. Nng mol ca mi mui Cu(NO3)2 v AgNO3 trong dung dch ban u l: A. 0,1M v 0,2M B. 0,1M v 0,1M C. 0,2M v 0,3M D. 0,1M v 0,4M

Cu 54: Khi cho dng in c cng 0,804A i trong 2 gi qua 160 ml dung dch cha AgNO3 v Cu(NO3)2 catot thot ra 3,44 gam hn hp ca hai kim loi. Bit dung dch thu c khi kt thc th nghim khng cha ion ng v ion bc. Nng (mol/lt) ca hai mui trong dung dch ban u l: A. AgNO3 = Cu(NO3)2 = 0,120M B. AgNO3 = Cu(NO3)2 = 0,250M

C. AgNO3 = Cu(NO3)2 = 0,375M D. AgNO3 = Cu(NO3)2 = 0,125M

Cu 55: in phn 100 ml dung dch AgNO3 0,1M v Cu(NO3)2 0,2M vi cng dng in I = 1,93A. Sau mt thi gian thu c mt khi lng kim loi bm trn catot l 1,72 gam. Thi gian in phn l: A. 500s B. 1000s C. 750s D. 250s



Cu 56: in phn 500 ml dung dch AgNO3 0,1M v Cu(NO3)2 0,2M vi cng dng in I = 10A v in cc tr. Sau thi gian t ta ngt dng in. Dung dch sau in phn c ly ra ngay o nng cc cht. Bit hiu sut in phn l 100% v th tch dung dch coi nh khng thay i, nng mol ion H

+ l 0,16M. Khi lng ca catot tng ln l:

A. 0,96 gam B. 6,36 gam C. 5,4 gam D. 3,2 gam

Cu 57: in phn 500 ml dung dch AgNO3 0,1M v Cu(NO3)2 0,2M vi cng dng in I = 10A v in cc tr. Sau thi gian t ta ngt dng in. Dung dch sau in phn c ly ra ngay o nng cc cht. Nu hiu sut in phn l 100% v th tch dung dch coi nh khng thay i, nng mol ion H

+ l 0,16M. Nng mol/l ca mui nitrat trong dung dch sau in phn l:

A. 0,2M B. 0,17M C. 0,15M D. 0,3M

Cu 58: in phn 500 ml dung dch AgNO3 0,1M v Cu(NO3)2 0,2M vi cng dng in I = 10A v in cc tr. Sau thi gian t ta ngt dng in. Dung dch sau in phn c ly ra ngay o nng cc cht. Nu hiu sut in phn l 100% v th tch dung dch coi nh khng thay i, nng mol ion H

+ l 0,16M. Thi gian t l:

A. 15 pht B. 690s C. 700s D. 18 pht

Cu 59: in phn 100 ml dung dch cha AgNO3 0,1M v Cu(NO3)2 0,1M vi cng dng in l 1,93A (H = 100%). Thi gian in phn kt ta ht Ag (t1), kt ta ht Ag v Cu (t2). Gi tr ca t1 v t2 ln lt l: A. 500s v 1000s B. 1000s v 1500s C. 500s v 1200s D. 500s v 1500s

Cu 60: Cho mt dng in c cng khng i i qua 2 bnh in phn mc ni tip, bnh 1 cha 100 ml dung dch CuSO4 0,01M, bnh 2 cha 100 ml AgNO3 0,01M. Bit rng sau thi gian in phn 500s th bn bnh 2 xut hin kh bn catot. Cng dng in, khi lng ca Cu bm trn catot v th tch kh(ktc) xut hin bn anot ca bnh 1 ln lt l: A. 0,193A; 0,032 gam Cu; 11,2 ml O2 B. 0,386A; 0,064 gam Cu; 22,4 ml O2

C. 0,193A; 0,032 gam Cu; 22,4 ml O2 D. 0,193A; 0,032 gam Cu; 5,6 ml O2

Cu 61: in phn 100 ml dung dch CuSO4 0,2 M v AgNO3 0,1M vi cng dng in I = 3,86 A. Thi gian in phn c mt khi lng kim loi bm ln catot l 1,72 gam l: A. 250s B. 1000s C. 500s D. 750s

Cu 62: Trn 200 ml dung dch AgNO3 xM vi 250 ml dung dch Cu(NO3)2 yM c dung dch A. Ly 250 ml dung dch A in phn vi in cc tr, I = 0,429A. Sau 5 gi in phn thy khi lng kim loi thu c l 6,36 gam. Gi tr ca x v y ln lt l: A. 0,45 v 0,108. B. 0,25 v 0,45. C. 0,108 v 0,25. D. 0,25 v 0,35.

Cu 63: Khi in phn 1000 gam dung dch bc nitrat 5,l%, catot thot ra 10,8 gam cht rn. Sau cho thm vo bnh in phn 500 gam dung dch ng (II) clorua 13,5% v in phn cho n khi anot thot ra 8, 96 lit kh (ktc). Nng % cc cht trong dung dch cui cng l: A. 1,3% HNO3 B. 1,3% AgNO3 C. 1,3% Cu(NO3)2 D. 1,3% CuCl2

Cu 64: in phn 200 ml dung dch CuSO4 0,1M v MgSO4 cho n khi kh bt u si bt bn catot th ngng in phn. Khi lng kim loi bm ln catot v th tch kh (ktc) thot ra anot l: A. 1,28 gam v 0,224 lt B. 0,64 gam v 0,112 lt

C. 1,28 gam v 0,112 lt D. 0,64 gam v 0,224 lt

Cu 65: Cho mt dung dch cha ng thi 0,01 mol NaCl; 0,02 mol CuCl2; 0,01 mol FeCl3; 0,06 mol CaCl2. Kim loi u tin thot ra catot khi in phn dung dch trn l: A. Fe B. Zn C. Cu D. Ca

Cu 66: in phn 100 ml dung dch A cha ng thi HCl 0,1M v NaCl 0,2M vi in cc tr c mng ngn xp ti khi anot thot ra 0,224 lit kh (ktc) th ngng in phn. Dung dch sau khi in phn c pH (coi th tch dung dch thay i khng ng k) l: A. 6 B. 7 C. 12 D. 13

Cu 67: Tin hnh in phn (c mng ngn xp) 500 ml dung dch cha hn hp HCl 0,02M v NaCl 0,2M. Sau khi anot bay ra 0,448 lit kh ( ktc) th ngng in phn. Th tch dung dch HNO3 0,1M cn dng trung ho dung dch thu c sau in phn l: A. 200 ml B. 300 ml C. 250 ml D. 400 ml

Cu 68: Tin hnh in phn (c mng ngn xp) dung dch X cha hn hp gm 0,02 mol HCl v 0,05 mol NaCl vi Cng dng in l 1,93A trong thi gian 3000 giy, thu c dung dch Y. Nu cho qu tm vo X v Y th thy (cho H = 1; Cl = 35,5):



A. X lm qu tm, Y lm xanh qu tm B. X lm qu tm, Y lm qu tm C. X lm qu tm, Y khng i mu qu tm D. X khng i mu qu tm, Y lm xanh qu tm Cu 69: in phn 2 lt dung dch HCl v KCl trong bnh in phn c mng ngn, I = 21,23A, sau 15 pht th dung dch c pH = 3. pH ca dung dch lc u l: A. 1 B. 2 C. 3 D. 4

Cu 70: in phn c mng ngn 500 ml dung dch cha hn hp gm CuCl2 0,1M v NaCl 0,5M (in cc tr, hiu sut in phn 100%) vi cng dng in 5A trong 3860 giy. Dung dch thu c sau in phn c kh nng ho tan m gam Al. Gi tr ln nht ca m l: A. 4,05. B. 2,70. C. 1,35. D. 5,40.

(Trch thi tuyn sinh H C khi B 2009) Cu 71: in phn 500 ml dung dch A cha CuCl2 0,2M; NaCl 0,1M vi cng dng in I = 4A, thi gian t giy n khi bt u c kh thot ra catot th dng li.Gi tr ca t l: A. 4250 giy B. 3425 giy C. 4825 giy D. 2225 giy

Cu 72: in phn dung dch c ha tan 10,16 gam FeCl2 v 3,51 gam NaCl ( c mng ngn v in cc tr) trong thi gian 33 pht 20 giy vi cng dng in I = 9,65A. Dung dch sau in phn trung ha va V lit dung dch HCl 0,2M. Gi tr ca V l: A. 0,18 B. 0,2 C. 0,3 D. 0,5

Cu 73: in phn 500 ml dung dch gm CuCl2 0,1M; FeCl3 0,1M; HCl 0,1M ri in phn bng in cc tr vi cng dng in I = 9,65A trong thi gian 41 pht 40 giy (hiu sut qu trnh in phn l 100%). Khi lng cc cht thot ra catot v th tch kh thot ra ti anot (ktc) l: A. 4,65 gam; 2,8 lt. B. 5,45 gam; 2,24 lt. C. 5,32 gam; 4,48 lt. D. 4,56 gam; 11,2 lt.

Gio vin: V Khc Ngc

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