Cu 1: Dung dch X cha HCl, CuSO4, Fe2(SO4)3

Cu 1: Dung dch X cha HCl, CuSO4, Fe2(SO4)3. Ly 400 ml dung dch X em in phn vi in cc tr, I=7,724A cho n khi cactot thu c 5,12 gam Cu th dng li. Khi anot c 0,1 mol mt cht kh bay ra. Thi gian in phn v nng ion Fe2+ ln lt l:A. 2300s v 0,15M B. 2300s v 0,10MC. 2500s v 0,10M D. 2500s v 0,15MCu 2: Hn hp X gm Fe, Fe2O3, Fe3O4 v FeO vi s mol mi cht l 0,1 mol. Ha tan ht X vo dung dch Y gm HCl v H2SO4 long d thu c dung dch Z. Nh t t dung dch Cu(NO)2 1M vo dung dch Z cho ti khi kh NO ngng bay ra. Th tch dung dch Cu(NO3)2 cn dng l:A. 500ml B. 50ml C. 250ml D. 25mlCu 3: in phn 100 ml dung dch hn hp cha CuSO4 0,1M v NaCl 0,1M trong bnh in phn c mng ngn vi hai in cc tr, cng dng in 0,5A. Sau mt thi gian thu c dung dch c pH=2 (gi s th tch dung dch khng i). Thi gian (giy) in phn v khi lng Cu (gam) thu c catot ln lt l:A. 1930 v 0,176 B. 2123 v 0,352C. 1737 v 0,176 D. 1939 v 0,352Cu 4: Ha tan hn hp gm 6,4 gam CuO v 16 gam Fe2O3 trong 160 ml dung dch H2SO4 2M. Sau phn ng thy c m gam cht rn khng tan. Gi tr ca m l:A. 4,8 B. 3,2 C. 3,2 < m< 4,8 D. 4 gamCu 5: Nung m gam hn hp X gm FeS v FeS2 trong mt bnh kn (gm 20% th tch O2 v 80% th tch N2) n khi phn ng xy ra hon ton, thu c cht rn v hn hp kh Y c thnh phn th tch: N2 =84,77% ; SO2 = 10,6% cn li l oxi. Thnh phn phn trm theo khi lng ca FeS trong X l:A. 68,75% B. 42,3% C. 26,83% D. 59,46%Cu 6: Ha tan hon ton hn hp gm FeS2 0,24 mol v Cu2S a mol vo dung dch HNO3 va c dung dch X (ch cha 2 mui sunfat) v V lt kh NO duy nht (ktc). Gi tr ca V l:A. 35,84 lt B. 34,048 lt C. 25,088 lt D. 39,424 ltCu 7: t chy hon ton m gam FeS2 bng mt lng oxi va , thu c kh X. Hp th ht X vo 1 lt dung dch cha Ba(OH)2 0,15M v KOH 0,1M thu c dung dch Y v 27,125 gam kt ta. Cho Y vo dung dch NaOH thy xut hin thm kt ta. Gi tr ca m l:A. 18,0 B. 16,5 C. 13,8 D. 36,0Cu 8: Ha tan ht hn hp A gm x mol Fe v y mol Ag bng dung dch HNO3 v H2SO4 c 0,062 mol kh NO v 0,047 mol SO2 thot ra. em c cn dung dch sau phn ng th thu c 22,164 gam hn hp cc mui (khng c mui amoni). Tr s ca x v y ln lt l:A. x=0,12; y=0,02 B. x=0,08 y=0,03C. x=0,07; y=0,02 D. x=0,09; y=0,01Cu 9: Nung hn hp A gm 0,56 gam Fe, 16 gam Fe2O3 v a gam Al nhit cao khng c khng kh n phn ng hon ton c hn hp D. Cho D tan ht trong H2SO4 long c V lt kh nhng nu cho D tc dng vi NaOH d th thu c 0,25V lt kh. Gi tr ca a l:A. 7,77 B. 5,55 C. 8,88 D. 6,66Cu 10: Cho m gam Fe tan ht trong dung dch cha ng thi H2SO4 v HNO3 thu c dung dch X v 4,48 lt kh NO duy nht. Thm thip H2SO4 vo X li thu c 1,792 lt kh NO duy nht na v dung dch Y. Dung dch Y ha tan va 8,32 gam Cu khng c kh bay ra. Cc kh o iu kin tiu chun. Khi lng Fe cho vo l:A. 16,24 gam B. 9,6 gam C. 16,8 gam D. 11,2 gamCu 11: Cho a gam hn hp A gm Fe2O3, Fe3O4 v Cu vo dung dch HCl d thy c 1 mol axit phn ng v cn li 0,256a gam cht rn khng tan. Mt khc kh hon ton a gam hn hp A bng H2 d thu c 42 gam cht rn. Tnh phn trm khi lng ca Cu trong hn hp A?A. 50% B. 25,6% C. 32% D. 44,8%Cu 12: Cho a gam Cu, Fe vo dung dch cha b mol H2SO4 c, nng thu c kh SO2 v dung dch cha 3 mui c khi lng l m gam. Cho bit mi lin h gia m, a, b?A. m=a+24b B. m=a+96b C. m=a+ 72b D. m=a+48bCu 13: Cho bt Fe vo dung dch hn hp NaNO3 v H2SO4 n phn ng hon ton thu c dung dch A, hn hp kh X gm NO v H2, cn cht rn khng tan. Bit dung dch A khng cha mui amoni. Trong dung dch A cha cc mui:A. FeSO4, Fe(NO3)2, Na2SO4, NaNO3 B. FeSO4, Fe2(SO4)3, Na2SO4, NaNO3C. FeSO4, Na2SO4 D. FeSO4, Fe(NO3)2, Na2SO4Cu 14: Cho cc cht Fe, dd FeCl2, dd HCl, dd Fe(NO3)2, dd FeCl3, dd AgNO3. Cho tng cp cht phn ng vi nhau th s cp cht c phn ng oxi ha kh xy ra l:A. 6 B. 5 C. 4 D. 7Cu 15: Cho phn ng: Cu2S + H2SO4 c CuSO4 + SO2 + H2O. T l s mol H2SO4 to mui v H2SO4 to kh l:A. 1:5 B. 1:3 C. 4:1 D. 1:4Cu 16: Cho kh CO d i qua hn hp X gm CuO, FeO v MgO nung nng thu c hn hp Y. Cho Y vo dung dch FeCl3 d thu c cht rn Z. Vy Z l:A. Cu, Al2O3, MgO B. Cu v MgO C. MgO D. CuCu 17: Dy gm cc cht u tc dng vi Fe(NO3)2 l:A. NaOH, Mg, KCl, H2SO4 B. KI, Br2, NH3, ZnC. AgNO3, NaOH, Cu, FeCl3 D. AgNO3, Br2, NH3, HClCu 18: Ha tan hon ton 74 gam hn hp X gm FeO, Fe3O4, Fe2O3 bng dung dch H2SO4 long d, sinh ra 178 gam mui sunfat. Nu cng 74 gam hn hp X trn tc dng vi 1 lng d kh CO nhit cao v dn sn phm kh qua dung dch nc vi trong d th khi lng (gam) kt ta to thnh l bao nhiu? (cc phn ng xy ra hon ton)A. 130 B. 150 C. 180 D. 240Cu 19: Chia hn hp X gm Na, Al v Fe thnh 3 phn bng nhau: Phn 1 cho tc dng vi nc d thu c V lt kh. Phn 2 cho tc dng vi NaOH d thu c 7V/4 lt kh. Phn 3 cho tc dng vi HCl d thu c 9v/4 lt kh (cng iu kin). Thnh phn % theo khi lng ca Na trong hn hp X l:A. 21,2% B. 12,9% C. 21,698% D. 17,29%Cu 20: A l hn hp cc mui Al(NO3)3, Cu(NO3)2, Fe(NO3)2, Mg(NO3)2. Cho NH3 d vo dung dch A thu c kt ta X. Lc ly kt ta X, em nung trong khng kh n khi lng khng i thu c hn hp rn Y. Cho lung kh CO d qua Y nung nng thu c hn hp rn Z. Hn hp rn Z gm:A. Al2O3, MgO, Fe, Cu B. Al2O3, MgO, FeC. MgO, Fe D. MgO, Fe, CuCu 21: Cho m gam bt Fe vo 100ml dung dch Cu(NO3)2 1M v AgNO3 4M. Sau khi kt thc thu c dung dch cha 3 mui (trong c mt mui ca Fe) v 32,4 gam cht rn. Gi tr ca m l:A. 8,4 B. 11,2 C. 5,6 D. 16,8Cu 22: Cho hn hp gm Mg v Cu tc dng vi 200 ml dung dch hn hp hai mui AgNO3 0,3M v Cu(NO3)2 0,25M. Sau khi cc phn ng xy ra hon ton thu c dung dch A v cht rn B. Cho dung dch A tc dng vi dung dch NaOH d, lc ly kt ta nung n khi lng khng i c 3,6 gam hn hp X gm 2 oxit. Ha tan hon ton B trong dung dch H2SO4 c nng d thu c 2,016 lt kh SO2 (ktc). Phn trm khi lng ca Mg trong hn hp ban u l:A. 32,5% B. 42,4% C. 56,8% D. 63,5%Cu 23: Hn hp X gm Fe2O3, ZnO, Cu tc dng vi dung dch HCl d thu c dung dch Y v phn khng tan Z. Cho Y tc dng vi dung dch NaOH long d thu c kt ta gm:A. Fe(OH)3 B. Fe(OH)2, Cu(OH)2, Zn(OH)2C. Fe(OH)3 v Zn(OH)2 D. Fe(OH)2 v Cu(OH)2Cu 24: Cho 2,6 gam FeS2 tan trong dung dch H2SO4 c, nng d thu c V lt kh (0oC v 0,5 atm). Gi tr ca V l:A. 1,680 B. 3,360 C. 6,720 D. 4,928Cu 25: Cho hn hp A gm 0,1 mol FeCO3, 0,2 mol Mg v 0,16 mol FeO tc dng vi 0,5 lt dung dch HNO3 (ly d 10% so vi lng phn ng) thu c 0,06 mol hn hp gm 3 kh N2, N2O v NO vi th tch bng nhau. Nng mol/lt ca dung dch HNO3 dng l:A. 2,56M B. 2,68M C. 2,816M D. 2,948MCu 26: Cho m gam hn hp gm Fe v Cu tc dng vi dung dch HNO3, sau khi cc phn ng kt thc th ch thu c 4,48 lt hn hp hai kh NO v NO2 l hai sn phm kh (ktc), v cn li 13,2 gam cht rn gm hai kim loi. Gi tr ca m l:A. 17,12 gam B. 24,96 gam C. 30 gam D. 16 gamCu 27: Cho cc cht sau: Fe, Mg, Cu, AgNO3, CuCl2, Fe(NO3)2. S cp cht tc dng c vi nhau l:A. 6 B. 8 C. 9 D. 7Cu 28: Ha tan ht 4 gam hn hp A gm Fe v mt oxit st trong dung dch HCl d thu c dung dch X. Sc kh Cl2 cho n d vo dung dch X thu c dung dch Y cha 9,75 gam mui tan. Nu cho 4 gam A tc dng vi dung dch HNO3 long d thu c V lt kh NO (spk duy nht, ktc). Gi tr ca V l:A. 0,747 B. 0,896 C. 1,120 D. 0,726Cu 29: Cho kh H2S d vo 100ml dung dch cha cc cht tan FeSO4 0,1M ; CuSO4 0,1M ; Fe2(SO4)3 0,1M. Sau khi cc phn ng xy ra hon ton thu c m gam kt ta. Gi tr ca m l:A. 2,16 B. 1,28 C. 0,96 D. 3,92Cu 30: Cho hi nc d i qua m gam cacbon, nung nhit cao thu c hn hp kh v hi X gm CO, CO2, H2 v H2O. Cho X tc dng vi CuO d, nung nng thu c hn hp cht rn Y. Ha tan ht Y trong dung dch HNO3 thy thot ra 6,72 lt kh NO (spk duy nht, ktc). Gi s cc phn ng xy ra hon ton. Gi tr ca m l:A. 2,7 B. 2,4 C. 2,526 D. 3,6Cu 31: Cho m gam bt Fe tc dng vi dung dch HNO3 long, thu c dung dch X v kh NO (spk duy nht). C cn dung dch thu c 51,2 gam mui khan. Bit rng s mol Fe ban u bng 31,25% s mol ca HNO3 phn ng. Gi tr ca m l:A. 14 B. 10,36 C. 20,72 D. 28Cu 32: Cho a mol Mg v b mol Fe vo dung dch cha c mol Cu2+ v d mol Ag+. Sau khi phn ng xy ra hon ton thu c dung dch cha hai ion kim loi. Bit rng 2a>d. Tm iu kin thu c kt ta ny:A. d = 2(a+b-c) B. 2a < 2c + dC. b c a D. d -2b 2(a-c) dCu 33: in phn dung dch cha 0,1 mol FeCl3, 0,2 mol CuCl2 v 0,1 mol HCl (in cc tr mng ngn xp). Khi cactot bt u si bt kh th dng in phn. Nu kim loi thot ra v bm hon ton vo catot, th ti thi im ny khi lng catot tng ln:A. 12,8 gam B. 5,6 gam C. 2,0 gam D. 18,4 gamCu 34: ng thau c tnh cng hn Cu, dng ch to cc chi tit my, cc thit b trong cng nghip ng tu bin. ng thau l hp kim ca Cu vi:A. Zn (45%) B. Ni(25%) C. Au(5%) D. Sn (55%)Cu 35: Ha tan hn hp cha ng thi 0,15 mi kim loi Fe v Cu trong 675 ml dung dch AgNO3 1M. Khi lng cht rn thu c sau phn ng l:A. 64,8 gam B. 75,3 gam C. 70,2 gam D. 72,9 gamCu 36: Cho hn hp gm 9,6 gam Cu v 5,6 gam Fe vo dung dch HNO3 long. Khuy u v phn ng hon ton thy c 3,136 lt kh NO (spk duy nht, ktc) thot ra, cn li m gam cht rn khng tan. Gi tr ca m l:A. 2,24 gam B. 2,56 gam C. 1,92 gam D. 2,8 gamCu 37: Cho hn hp X gm 0,09 mol Fe v 0,05 mol Fe(NO3)2.7H2O vo 500 ml dung dch HCl 1M, kt thc phn ng thu c dung dch Y v kh NO (spk duy nht). Hi dung dch Y ha tan ti a bao nhiu gam Cu?A. 3,84 gam B. 4,48 gam C. 4,26 gam D. 7,04 gamCu 38: Chia 30,4 gam hn hp gm Fe v Cu thnh hai phn bng nhau. Phn 1 cho tc dng ht vi dung dch H2SO4 c, nng d thu c 6,72 lt kh SO2 (spk duy nht, ktc). Ha tan phn 2 trong 500 ml dung dch AgNO3 1M, kt thc phn ng thu c dung dch Y. Nng mol/lt ca Fe(NO3)2 trong dung dch Y (coi th tch dung dch khng thay i trong qu trnh phn ng) l:A. 0,181M B. 0,363M C. 0,182M D. 0,091MCu 39: in phn (in cc tr khng mng ngn, hiu sut 100%) dung dch cha 0,15 mol Cu(NO3)2 v 0,1 mol Fe(NO3)3 bng dng in c cng 1A. Khi lng catot tng ln sau 5790 giy in phn l:A. 9,6 gam B. 9,8 gam C. 15,2 gam D. 1,6 gamCu 40: Chia m gam hn hp X gm FeS v CuS thnh hai phn bng nhau. Cho phn 1 phn ng vi dung dch HCl d thu c 2,24 lt kh (ktc). Ha tan ht phn hai trong dung dch HNO3 long d, sinh ra 15,68 lt kh NO (spk duy nht, ktc). Gi tr ca m l:A. 46,4 B. 58,0 C. 23,2 D. 34,8Cu 41: Thc hin phn ng nhit Al (trong iu kin khng c khng kh, hiu sut 100%) vi 9,66 gam gam hn hp X gm Al v mt oxit st, thu c hn hp rn Y. Ha tan Y bng dung dch NaOH d, sau khi cc phn ng xy ra hon ton thu c dung dch Z, cht khng tan T v 0,03 mol kh. Sc CO2 n d vo dung dch Z, lc kt ta nung n khi lng khng i c 5,1 gam cht rn. Cng thc ca oxit st v khi lng ca n trong hn hp X trn l:A. FeO v 7,20 gam B. Fe3O4 v 6,96 gamC. Fe3O4 v 2,76 gam D. Fe2O3 v 8,00 gamCu 42: Trn 0,25 mol bt Al vi 0,15 mol mol bt Fe2O3 ri tin hnh phn ng nhit nhm trong iu kin khng c khng kh thu c hn hp cht rn X. Cho X tc dng vi dung dch NaOH d thu c dung dch Y, m gam cht rn khng tan Z v 0,15 mol kh H2. Hiu sut ca phn ng nhit nhm v gi tr ca m ln lt l:A. 60% v 20,4 gam B. 60% v 30,75 gamC. 50% v 30,75 gam D. 50% v 40,8 gamCu 43: Nung m gam hn hp X gm Al v Fe3O4 trong bnh kn khng c khng kh n phn ng hon ton thu c hn hp rn Y. Chia Y thnh hai phn bng nhau. Phn 1 cho tc dng vi dung dch HNO3 long d thu c 0,11 mol NO (spk duy nht). Phn 2 cho tc dng vi dung dch NaOH d thu c 0,03 mol kh H2 . Gi tr ca m l:A. 15,00 B. 19,32 C. 7,5 D. 9,66Cu 44: Trn u 6,102 gam hn hp Al, Fe3O4 v CuO (cc cht c cng s mol) ri tin hnh phn ng nhit nhm thu c hn hp X. Cho X tc dng vi dung dch HNO3 d thu c V ml (ktc) hn hp kh NO2 v NO theo t l mol tng ng l 1:1 v dung dch khng cha NH4+. Gi tr ca V l:A. 604,8 B. 645,12 C. 806,4 D. 403,2Cu 45: Tin hnh phn ng nhit nhm m gam hn hp A gm Al v FexOy thu c hn hp rn B1. Cho B1 tc dng vi dung dch NaOH d th thu c 0,672 lt kh (ktc), dung dch C v cht khng tan D1. Cho t t dung dch HCl vo C n khi thu c lng kt ta ln nht, lc ly kt ta, ra sch em nung nhit cao n khi lng khng i thu c 5,1 gam cht rn. Cht khng tan D1 cho tc dng vi dung dch H2SO4 c, nng (lng t nht). Sau phn ng ch thu c dung dch E cha mt mui st duy nht v 2,688 lt kh SO2 (cht kh ktc v cc phn ng xy ra hon ton). Gi tr ca m l:A. 14,3 B. 11,34 C. 25,9 D. 9,9