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PHNG PHP BO TON ELECTRON( 2) Cu 1: Ha tan hon ton 2,4 gam kim loi Mg vo dung dch HNO3 long, gi s ch thu c V lt kh N2 duy nht (ktc). Gi tr ca V l A. 0,672 lt. B. 6,72lt. C. 0,448 lt. D. 4,48 lt. Cu 2: Cho m gam Cu phn ng ht vi dung dch HNO3 thu c 8,96 lt (ktc) hn hp kh NO v NO2 c t khi i vi H2 l 19. Gi tr ca m l A. 25,6 gam. B. 16 gam. C. 2,56 gam. D. 8 gam. Cu 3: Ha tan 4,59 gam Al bng dung dch HNO3 thu c hn hp kh NO v N2O c t khi hi i vi hiro bng 16,75. Th tch NO v N2O thu c ktc l: A. 2,24 lt v 6,72 lt. B. 2,016 lt v 0,672 lt. C. 0,672 lt v 2,016 lt. D. 1,972 lt v 0,448 lt. Cu 4: Cho m gam Al tan hon ton trong dung dch HNO3 th thy thot ra 11,2 lt (ktc) hn hp kh A gm 3 kh N2, NO, N2O c t l s mol tng ng l 2:1:2. Gi tr m l bao nhiu ? A. 27 gam. B. 16,8 gam. C. 35,1 gam. D. 53,1 gam. Cu 5: Ha tan hon ton 12,42 gam Al bng dung dch HNO3 long (d), thu c dung dch X v 1,344 lt ( ktc) hn hp kh Y gm hai kh l N2O v N2. T khi ca hn hp kh Y so vi kh H2 l 18. C cn dung dch X, thu c m gam cht rn khan. Gi tr ca m l: A. 97,98. B. 106,38. C. 38,34. D. 34,08. Cu 6: Chia hn hp gm Mg v MgO thnh 2 phn bng nhau: - Phn 1: Cho tc dng ht vi dung dch HCl thu c 3,136 lt H2 (ktc), dung dch sau phn ng cha 14,25 gam mui - Phn 2: Cho tc dng ht vi dung dch HNO3 thu dc 0,448 lt kh X nguyn cht (ktc). C cn cn thn v lm kh dung dch sau phn ng thu c 23 gam mui. Cng thc phn t ca kh X l: A. N2O. B. NO2. C. N2. D. NO. Cu 7: Cho 3,024 gam mt kim loi M tan ht trong dung dch HNO3 long, thu c 940,8 ml kh (ktc) NxOy (sn phm kh duy nht) c t khi i vi H2 bng 22. Kh NxOy v kim loi M l A. N2O v Fe. B. NO2 v Al. C. N2O v Al. D. NO v Mg. Cu 8: Ho tan 62,1 gam kim loi M trong dung dch HNO3 long thu c 16,8 lt hn hp kh X (ktc) gm 2 kh khng mu khng ho nu trong khng kh. T khi hi ca X so vi H2 l 17,2. Kim loi M l A. Mg. B. Ag. C. Cu. D. Al. Cu 9: Ha tan hon ton 16,2 gam mt kim loi ha tr cha r bng dung dch HNO3 c 5,6 lt (ktc) hn hp A nng 7,2 gam gm NO v N2. Kim loi cho l: A. Fe. B. Zn. C. Al. D. Cu. Cu 10: Ho tan ht 9,6 gam kim loi M trong dung dch H2SO4 c, nng, thu c SO2 l sn phm kh duy nht. Cho ton b lng SO2 ny hp th vo 0,5 lt dung dch NaOH 0,6M, sau phn ng em c cn dung dch c 18,9 gam cht rn. Kim loi M l A. Ca. B. Mg. C. Fe. D. Cu. Cu 11: Cho 11,2 gam hn hp Cu v kim loi M tc dng vi dung dch HCl d thu c 3,136 lt (ktc). Cng lng hn hp ny cho tc dng ht vi dung dch HNO3 long thu c 3,92 lt kh NO (ktc, sn phm kh duy nht). Kim loi M l A. Mg. B. Fe. C. Mg hoc Fe. D. Mg hoc Zn. Cu 12: Cho 7,22 gam hn hp X gm Fe v mt kim loi M c ho tr khng i, chia X thnh 2 phn bng nhau: Phn 1 tc dng vi HCl d thu c 2,128 lt kh (ktc) ; Phn 2 cho tc dng vi dung dch HNO3 d thu c 1,792 lt NO duy nht (ktc) Kim loi M v % M trong hn hp l: A. Al vi 53,68%. B. Cu vi 25,87%. C. Zn vi 48,12%. D. Al vi 22,44%. Cu 13: 1,84 gam hn hp Cu v Fe ha tan ht trong dung dch HNO3 to thnh 0,01 mol NO v 0,04 mol NO2. S mol Fe v Cu theo th t l A. 0,02 v 0,03. B. 0,01 v 0,02. C. 0,01 v 0,03. D. 0,02 v 0,04. Cu 14: Ho tan 2,64 gam hn hp Fe v Mg bng dung dch HNO3 long, d, thu c sn phm kh l 0,896 lt ( ktc) hn hp kh gm NO v N2, c t khi so vi H2 bng 14,75. Thnh phn % theo khi lng ca st trong hn hp ban u l A. 61,80%. B. 61,82%. C. 38,18%. D. 38,20%. Cu 15: Cho 18,4 gam hn hp Mg, Fe phn ng vi dung dch HNO3 (va ) c 5,824 lt hn hp kh NO, N2 (ktc). Khi lng hn hp kh l 7,68 gam. Khi lng ca Fe v Mg ln lt l: A. 7,2 gam v 11,2 gam. B. 4,8 gam v 16,8 gam. C. 4,8 gam v 3,36 gam. D. 11,2 gam v 7,2 gam. Cu 16: Ho tan hn hp gm Mg, Al trong V lt dung dch HNO3 2M va thu c 1,68 lt hn hp kh X (ktc) gm N2O v N2. T khi ca X so vi H2 l 17,2. Gi tr ca V l A. 0,42. B. 0,84. C. 0,48. D. 0,24. Cu 17: Ha tan hon ton 12 gam hn hp Fe, Cu (t l mol 1:1) bng axit HNO3, thu c V lt (ktc) hn hp kh X (gm NO v NO2), dung dch Y (khng cha mui NH4NO3). T khi ca X i vi H2 bng 19. Gi tr ca V l A. 2,24. B. 4,48 C. 5,60. D. 3,36. Cu 18: Hn hp X gm Cu v Fe c t l khi lng tng ng l 7:3. Ly m gam X phn ng hon ton vi dung dch cha 0,7 mol HNO3. Sau phn ng cn li 0,75m gam cht rn v c 0,25 mol kh Y gm NO v NO2. Gi tr ca m l A. 40,5. B. 50,4. C. 50,2. D. 50. Cu 19: Ha tan 14,8 gam hn hp Fe v Cu vo lng d dung dch hn hp HNO3 v H2SO4 c nng. Sau phn ng thu c 10,08 lt NO2 v 2,24 lt SO2 (u kc). Khi lng Fe trong hn hp ban u l A. 5,6 gam. B. 8,4 gam. C. 18 gam. D. 18,2 gam. Cu 20: Ho tan hon ton 8,9 gam hn hp Zn, Mg bng dung dch H2SO4 c thu c 1,12 lt SO2 ( ktc), 1,6 gam S (l nhng sn phm kh duy nht) v dung dch X. Khi lng mui khan trong dung dch X l A. 28,1 gam. B. 18,1 gam. C. 30,4 gam. D. 24,8 gam. Cu 21: Cho 1,35 gam hn hp gm Cu, Mg, Al tc dng vi dung dch HNO3 d, thu c 1,12 lt (ktc) hn hp kh NO v NO2 c t khi so vi hiro bng 20. Tng khi lng mui nitrat sinh ra l A. 66,75 gam. B. 33,35 gam. C. 6,775 gam. D. 3, 335 gam.

Cu 22: Ha tan hon ton m gam hn hp 3 kim loi cha r ha tr bng dung dch HNO3 thu c V lt hn hp kh A (ktc) gm NO2 v NO (khng sinh ra mui NH4NO3). T khi hi ca A so vi H2 bng 18,2. Tng s gam mui khan to thnh theo m v V l: A. m+6,0893V. B. m+ 3,2147. C. m+2,3147V. D. m+6,1875V. Cu 23: Cho hn hp gm 1,12 gam Fe v 1,92 gam Cu vo 400 ml dung dch cha hn hp gm H2SO4 0,5M v NaNO3 0,2M. Sau khi cc phn ng xy ra hon ton, thu c dung dch X cha m gam mui v kh NO (sn phm kh duy nht). Cho V ml dung dch NaOH 1M vo dung dch X th lng kt ta thu c l ln nht. Gi tr ti thiu ca V l: A. 240. B. 120. C. 360. D. 400. Cu 24: Cho 61,2 gam hn hp X gm Cu v Fe3O4 tc dng vi dung dch HNO3 long, un nng v khuy u. Sau khi cc phn ng xy ra hon ton, thu c 3,36 lt kh NO (sn phm kh duy nht, ktc), dung dch Y v cn li 2,4 gam kim loi. C cn dung dch Y, thu c m gam mui khan. Gi tr ca m l: A. 97,5.B. 108,9. C. 137,1. D.151,5. Cu 25: Cho hn hp gm 0,01 mol Al v 0,02 mol Mg tc dng vi 100 ml dung dch cha AgNO3 v Cu(NO3)2, sau khi phn ng xy ra hon ton thu c m gam cht rn X gm 3 kim loi, X tc dng hon ton vi HNO3 c, d thu c V lt NO2 ( ktc v duy nht). Gi tr ca V lA. 1,232. B. 1,456. C. 1,904. D. 1,568. Cu 26: Chia 10 gam hn hp gm Mg, Al, Zn thnh hai phn bng nhau. Phn 1 c t chy hon ton trong O2 d thu c 21 gam hn hp oxit. Phn hai ha tan trong HNO3 c, nng d thu c V lt NO2 (sn phm kh duy nht) ktc. Gi tr ca V l: A. 22,4. B. 44,8. C. 89,6. D. 30,8. Cu 27: Cho dung dch X cha 0,1 mol FeCl2, 0,2 mol FeSO4. Th tch dung dch KMnO4 0,8M trong H2SO4 long va oxi ha ht cc cht trong X l: A. 0,075 lt. B. 0,125 lt. C. 0,3 lt. D. 0,03 lt. Cu 28: Ha tan 5,6 gam Fe bng dung dch H2SO4 long d thu c dung dch X. Dung dch X phn ng va vi V ml dung dch KMnO4 0,5M. Gi tr ca V l: A. 20 ml. B. 80 ml. C. 40 ml. D. 60 ml. Cu 29: Th tch dung dch FeSO4 0,5M cn thit phn ng va vi 100 ml dung dch cha KMnO4 0,2M v K2Cr2O7 0,1M mi trng axit l: A. 0,16 lt. B. 0,32 lt. C. 0,08 lt. D. 0,64 lt. Cu 30: 0,15 mol oxit st tc dng vi HNO3 un nng, thot ra 0,05 mol NO. Cng thc oxit st l A. FeO. B. Fe2O3. C. Fe3O4. D. FeO hoc Fe3O4. Cu 31: Ho tan hon ton m gam Fe3O4 vo dung dch HNO3 long d, tt c lng kh NO thu c em oxi ho thnh NO2 ri sc vo nc cng dng kh O2 chuyn ht thnh HNO3. Cho bit th tch kh oxi (ktc) tham gia qu trnh trn l 3,36 lt. Khi lng m ca Fe3O4 l gi tr no sau y? A. 139,2 gam. B. 13,92 gam. C. 1,392 gam. D. 1392 gam. Cu 32: Ha tan hon ton y gam mt oxit st bng H2SO4 c, nng thy thot ra kh SO2 duy nht. Trong th nghim khc, sau khi kh hon ton cng y gam oxit bng CO nhit cao ri ha tan lng st to thnh bng H2SO4 c, nng th thu c lng kh SO2 nhiu gp 9 ln lng kh SO2 th nghim trn. Cng thc ca oxit st l A. FeO. B. Fe2O3 C. Fe3O4. D. FeCO3. Cu 33: Cho 36 gam hn hp Fe, FeO, Fe3O4 tc dng hon ton vi dung dch H2SO4 c, nng d thy thot ra 5,6 lt kh SO2 ktc (sn phm kh duy nht). Tnh s mol H2SO4 phn ng. A. 0,5 mol. B. 1 mol. C.1,5 mol. D. 0,75 mol. Cu 34: Ho tan 20,8 gam hn hp bt gm FeS, FeS2, S bng dung dch HNO3 c nng d thu c 53,76 lt NO2 (sn phm kh duy nht, kc v dung dch A. Cho dung dch A tc dng vi dung dch NaOH d, lc ly ton b kt ta nung trong khng kh n khi lng khng i th khi lng cht rn thu c l A. 16 gam. B. 9 gam. C. 8,2 gam. D. 10,7 gam. Cu 35: Ha tan hon ton hn hp X gm 0,02 mol FeS2 v 0,03 mol FeS vo lng d H2SO4 c nng thu c Fe2(SO4)3, SO2 v H2O. Hp th ht SO2 bng mt lng va dung dch KMnO4 thu c dung dch Y khng mu, trong sut, c pH = 2. Tnh s lt ca dung dch (Y A. Vdd (Y) = 57 lt. B. Vdd (Y) = 22,8 lt. C. Vdd (Y) = 2,27 lt. D. Vdd (Y) = 28,5 lt. Cu 36: Ho tan hon ton m gam FexOy bng dung dch H2SO4 c nng thu c kh A v dung dch B. Cho kh A hp th hon ton bi dung dch NaOH d to ra 12,6 gam mui. Mt khc, c cn dung dch B th thu c 120 gam mui khan. Cng thc ca st oxit FexOy l: A. FeO B. Fe3O4. C. Fe2O3. D. Tt c u sai. Cu 37: Trn 5,6 gam bt st vi 2,4 gam bt lu hunh ri nung nng trong iu kin khng c khng kh, thu c hn hp rn Y. Cho Y tc dng vi lng d dung dch HCl, gii phng hn hp kh Z v cn li mt phn khng tan G. t chy hon ton Z v G cn va V lt O2 ( ktc). Gi tr ca V l A. 2,8. B. 3,36.C. 3,08.D. 4,48. Cu 38: t chy x mol Fe bi oxi thu c 5,04 gam hn hp (A) gm cc oxit st. Ha tan hon ton (A) trong dung dch HNO3 thu c 0,035 mol hn hp (Y) gm NO v NO2. T khi hi ca Y i vi H2 l 19. Tnh x A. 0,06 mol. B. 0,065 mol. C. 0,07 mol. D. 0,075 mol. Cu 39: Nung x gam Fe trong khng kh thu c 104,8 gam hn hp rn A gm Fe, FeO, Fe2O3, Fe3O4. Ha tan A trong dung dch HNO3 d, thu c dung dch B v 12,096 lt hn hp kh NO v NO2 (ktc) c t khi i vi He l 10,167. Khi lng x gam l bao nhiu? A. 74,8 . B. 87,4 . C. 47,8. D. 78,4. Cu 40: Trn 0,54 gam bt nhm vi bt Fe2O3 v CuO ri tin hnh phn ng nhit nhm thu c hn hp A. Ho tan hon ton A trong dung dch HNO3 c hn hp kh gm NO v NO2 c t l s mol tng ng l 1 : 3. Th tch (ktc) kh NO v NO2 ln lt l:A. 0,224 lt v 0,672 lt. B. 0,672 lt v 0,224 lt. C. 2,24 lt v 6,72 lt. D. 6,72 lt v 2,24 lt. Cu 41: Trn u 10,8 gam Al vi hn hp Fe2O3, CuO, Cr2O3 ri t nng tin hnh phn ng nhit nhm thu c hn hp X. Ha tan hon ton hn hp X trong dung dch HNO3 un nng thu c V lt (ktc) hn hp kh NO, NO2 c t khi so vi hiro l 21. V c gi tr l:A. 20,16 lt. B. 17,92 lt. C. 16,8 lt. D. 4,48 lt.

Cu 42: Kh 16 gam Fe2O3 bng kh CO nhit cao thu c hn hp rn X, cho hn hp X tc dng vi dung dch HNO3 d thu c 1,12 lt kh NO duy nht (ktc). Th tch kh CO2 (ktc) to ra khi kh Fe2O3 l A. 1,68 lt. B. 6,72 lt. C. 3,36 lt. D. 1,12 lt. Cu 43: Cho lung kh CO i qua ng s ng m gam Fe2O3 nung nng. Sau mt thi gian thu c 6,96 gam hn hp rn X, cho X tc dng ht vi dung dch HNO3 0,1M va thu c dung dch Y v 2,24 lt hn hp kh Z gm NO v NO2 c t khi so vi hiro l 21,8. a. m c gi tr l:A. 8 gam. B. 7,5 gam. C. 7 gam. D. 8,5 gam. b. Th tch dung dch HNO3 dng A. 4 lt. B. 1 lt. C. 1,5 lt. D. 2 lt. Cu 44: Cho 7,84 lt (ktc) hn hp kh oxi v clo tc dng va vi hn hp cha 0,1 mol Mg v 0,3 mol Al thu c m gam hn hp mui clorua v oxit. Gi tr ca m bng A. 21,7 gam. B. 35,35 gam. C. 27,55 gam. D. 21,7gam < m < 35,35 gam. Cu 45: Hn hp kh A gm clo v oxi. A phn ng va ht vi mt hn hp gm 4,8 gam magie v 8,1 gam nhm to ra 37,05 gam hn hp cc mui clorua v oxit hai kim loi. Thnh phn % th tch ca oxi v clo trong hn hp A l A. 26,5% v 73,5%. B. 45% v 55%. C. 44,44% v 55,56%. D. 25% v 75%. Cu 46: Cho 11,2 lt hn hp kh A gm clo v oxi phn ng va ht vi 16,98 gam hn hp B gm magie v nhm to ra 42,34 gam hn hp cc mui clorua v oxit hai kim loi. Thnh phn % khi lng ca magie v nhm trong hn hp B l A.48% v 52%. B. 77,74% v 22,26%. C. 43,15% v 56,85%. D.75% v 25%. Cu 47: t chy hon ton 7,2 gam kim loi M (c ho tr khng i trong hp cht) trong hn hp kh Cl2 v O2. Sau phn ng thu c 23,0 gam cht rn v th tch hn hp kh phn ng l 5,6 lt ( ktc). Kim loi M l A. Mg. B. Ca. C. Be. D. Cu. Cu 48: a. Cho hn hp cha x mol Mg, y mol Fe vo dung dch cha z mol CuSO4. Sau khi kt thc cc phn ng thu c cht rn gm 2 kim loi. Mun tho mn iu kin thA. x < z < y. B. z x. C. x z < x +y.D. z = x + y. b. Cho a mol kim loi Mg vo dung dch hn hp cha b mol CuSO4 v c mol FeSO4. Kt thc phn ng dung dch thu c cha 2 mui . Xc nh iu kin ph hp cho kt qu trn. A. a b. B. b a < b +c. C. b a b +c. D. b < a < 0,5(b + c). Cu 49: Cho hn hp gm 1,2 mol Mg v x mol Zn vo dung dch cha 2 mol Cu2+ v 1 mol Ag+ n khi cc phn ng xy ra hon ton, thu c mt dung dch cha ba ion kim loi. Trong cc gi tr sau y, gi tr no ca x tho mn trng hp trn ? A. 2. B. 1,2. C. 1,5. D. 1,8. Cu 184: Cho hn hp bt gm 9,6 gam Cu v 2,8 gam Fe vo 550 ml dung dch AgNO3 1M. Sau khi cc phn ng xy ra hon ton, thu c m gam cht rn. Gi tr ca m l (bit th t trong dy th in ho: Fe3+/Fe2+ ng trc Ag+/Ag) A. 54,0. B. 48,6. C. 32,4. D. 59,4. Cu 219: Cho 0,3 mol Magie vo 100 ml dung dch hn hp cha Fe(NO3)3 2M v Cu(NO3)2 1M, sau khi phn ng xy ra hon ton, khi lng kim loi thu c l:A. 12 gam. B. 11,2 gam C. 13,87 gam. D. 16,6 gam. Cu 225: Cho 6,48 gam bt kim loi nhm vo 100 ml dung dch hn hp Fe2(SO4)3 1M v ZnSO4 0,8M. Sau khi kt thc phn ng, thu c m gam hn hp cc kim loi. Tr s ca m l: A. 14,50 gam. B. 16,40 gam. C. 15,10 gam. D. 15,28 gam. Cu 50: Cho hn hp X (dng bt) gm 0,01 mol Al v 0,025 mol Fe tc dng vi 400 ml dung dch hn hp Cu(NO3)2 0,05M v AgNO3 0,125M. Kt thc phn ng, lc kt ta cho nc lc tc dng vi dung dch NaOH d thu c m gam kt ta. Gi tr ca m l A. 2,740 gam. B. 35,2 gam. C. 3,52 gam. D. 3,165 gam.

PP BO TON ELECTRON Cu 1: Hn hp X gm hai kim loi A v B ng trc H trong dy in ha v c ha tr khng i trong cc hp cht. Chia m gam X thnh hai phn bng nhau: - Phn 1: Ha tan hon ton trong dung dch cha axit HCl v H2SO4 long to ra 3,36 lt kh H2. - Phn 2: Tc dng hon ton vi dung dch HNO3 thu c V lt kh NO (sn phm kh duy nht).Bit cc th tch kh o iu kin tiu chun. Gi tr ca V l A. 2,24 lt. B. 3,36 lt.C. 4,48 lt.D. 6,72 lt. Cu 2: Hn hp A gm 2 kim loi R1, R2 c ho tr x, y khng i (R1, R2 khng tc dng vi nc v ng trc Cu trong dy hot ng ha hc ca kim loi). Cho hn hp A phn ng hon ton vi dung dch HNO3 d thu c 1,12 lt

kh NO duy nht ktc.Nu cho lng hn hp A trn phn ng hon ton vi dung dch HNO3 th thu c bao nhiu lt N2. Cc th tch kho ktc.A. 0,224 lt. B. 0,336 lt. C. 0,448 lt. D. 0,672 lt. Cu 3: Oxi ha 0,728 gam bt Fe ta thu c 1,016 gam hn hp hai oxit st (hn hp A). 1. Ha tan hn hp A bng dung dch axit nitric long, d. Tnh th tch kh NO duy nht bay ra(ktc). A. 2,24 ml. B. 22,4 ml. C. 33,6 ml. D. 44,8 ml. 2. Cng hn hp A trn trn vi 5,4 gam bt Al ri tin hnh phn ng nhit nhm (hiu sut 100%). Ha tan hn hp thu c sau phn ng bng dung dch HCl d. Tnh th tch bay ra (ktc). A. 6,608 lt. B. 0,6608 lt. C. 3,304 lt. D. 33,04. lt. Cu 4: Nung m gam bt st trong oxi, thu c 3 gam hn hp cht rn X. Ha tan ht hn hp X trong dung dch HNO3 (d), thot ra 1,68 lt (ktc) NO2 (l sn phm kh duy nht). Gi tr ca m l A. 2,52 gam. B. 2,22 gam. C. 2,62 gam. D. 2,32 gam. Cu 5: m gam phoi bo st A ngoi khng kh sau mt thi gian bin thnh hn hp B c khi lng 12 gam gm Fe v cc oxit FeO, Fe3O4, Fe2O3. Cho B tc dng hon ton vi axit nitric d thy gii phng ra 2,24 lt kh duy nht NO. Tnh khi lng m ca A? A. 10,08 gam. B. 8,88 gam. C. 10,48 gam. D. 9,28 gam. Cu 6: a gam bt st ngoi khng kh, sau mt thi gian s chuyn thnh hn hp A c khi lng l 75,2 gam gm Fe, FeO, Fe2O3 v Fe3O4. Cho hn hp A phn ng ht vi dung dch H2SO4 m c, nng thu c 6,72 lt kh SO2 (ktc). Khi lng a gam l: A. 56 gam. B. 11,2 gam. C. 22,4 gam. D. 25,3 gam. Cu 7: Nung m gam bt Cu trong oxi thu c 24,8 gam hn hp cht rn X gm Cu, CuO, Cu2O. Ho tan hon ton X bng H2SO4 c, nng thu c 4,48 lt (ktc) kh SO2 duy nht. Tnh gi tr m A. 9,68 gam. B. 15,84 gam. C. 20,32 gam. D. 22,4 gam. Cu 8: Cho 8,3 gam hn hp X gm Al, Fe (nAl = nFe) vo 100 ml dung dch Y gm Cu(NO3)2 v AgNO3. Sau khi phn ng kt thc thu c cht rn A gm 3 kim loi. Ha tan hon ton cht rn A vo dung dch HCl d thy c 1,12 lt kh thot ra (ktc) v cn li 28 gam cht rn khng tan B. Nng CM ca Cu(NO3)2 v ca AgNO3 ln lt l A. 2M v 1M. B. 1M v 2M. C. 0,2M v 0,1M. D. kt qu khc. Cu 9: Cho V lt hn hp kh Cl2 v O2 (ktc) tc dng va vi hn hp cha 2,7 gam Al v 3,6 gam Mg, thu c 22,1 gam sn phm rn. Tnh gi tr ca V. Cu 10: Hn hp X gm S v Br2 tc dng va vi hn hp Y gm 9,75 gam Zn, 6,4 gam Cu v 9,0 gam Ca thu c 53,15 gam cht rn.Tnh lng S trong X l? Cu 11: Ha tan mt hn hp X gm hai kim loi A v B trong dung dch HNO3 long. Kt thc phn ng thu c hn hp kh Y gm 0,1mol NO2, 0,15 mol NO2 v 0,05 mol N2O. bit rng khng c phn ng to mui NH4NO3. Tnh s mol HNO3 phn ng. Cu 12: Cho 12,9 gam hn hp Al, Mg phn ng vi dung dch hn hp 2 axit HNO3 v H2SO4 c nng, thu c 0,15 mol mi kh SO2, NO v 0,4 mol NO2. C cn dung dch thu c sau phn ng thu c m gam mui. Tnh gi tr ca m? Cu 13: Ha tan hon ton m gam Al trong dung dch HNO3 long thu c 1,12 lt hn hp X gm 3 kh NO, N2O, N2 c t l s mol l: 1:2:2. a. Tnh m b. Tnh s mol HNO3 phn ng Cu 14: Hn hp X gm 2 kim loi A, B c ha tr khng i, khng tan trong nc v u ng trc Cu trong dy hot ng ca kim loi. Ha tan hon ton m gam X trong dung dch CuSO4 d. Ton b lng Cu thu c cho tan ht vo dung dch HNO3 d thu c 1,12 lit NO duy nht. Mt khc ha tan m gam X vo dung dch HNO3 d th thu c V lit N2 duy nht. Xc nh V, bit cc th tch kh o ktc. Cu 15: C 200 ml dung dch HCl 1,2M v H2SO4 1,8M (long). Cho 32 gam hn hp gm Fe v Mg vo dung dch . Kh sinh ra c dn rt t t qua ng s cha 64 g CuO phn ng xy ra hon ton. Tnh th tch dung dch H2SO4 96% (c, d = 1,84 g/ml) cn ha tan ht cht rn trong ng. Cu 16: Sau khi un nng 23,7 gam KMnO4 thu c 22,74 gam hn hp cht rn. Cho hn hp cht rn trn tc dng hon ton vi dung dch axit HCl 36,5% (d = 1,18g/ml) un nng. 1. Vit cc phng trnh phn ng xy ra. 2. Tnh th tch kh Cl2 thu c ( ktc). 3. Tnh th tch dung dch axit HCl cn dng. Cu 17: Ha tan 7,18 gam mt thanh st cha tp cht Fe2O3 vo mt lng rt d dd H2SO4 long ri thm nc ct vo thu c 500 ml dung dch. Ly 25 ml dung dch cho tc dng vi dd KMnO4 th phi dng ht 12,5 ml dung dch KMnO4 0,096M. a. Xc nh hm lng Fe tinh khit trong thanh st. b. Nu ly cng mt lng thanh st nh trn v hm lng st tinh khit nh trn nhng cha tp cht l FeO v lm li th nghim nh trn th th tch dung dch KMnO4 0,096M cn dng l bao nhiu? Cu 18: Trn 1 lt dung dch A gm K2Cr2O7 0,15 M v KMnO4 0,2M vi 2 lt dung dch FeSO4 1,25M (mi trng H2SO4).a. FeSO4 b oxi ha ht cha. b. Phi thm vo dung dch thu c trn bao nhiu lt dung dch A phn ng oxi ha kh xy ra va . Cu 19: Mt mu st c cha tp cht c khi lng 30 gam tc dng vi 4 lt dd HCl 0,5M ly d ( tp cht khng tham gia phn ng) cho ra kh A v dung dch B. t chy hon ton kh A, cho sn phm chy i qua bnh ng H2SO4 c th thy khi lng bnh tng 9 gam. a. Tnh %Fe nguyn cht trong mu cht trn.

b. Ly dung dch B thm vo V lt dd KmnO4 0,5M va trong dung dch H2SO4 long, un nng, c kh C thot ra. dn kh ny vo dung dch B cn li th thu c mui D. tnh th tch dung dch KMnO4 v khi lng ca D. Cu 20: un nng 28 g bt st trong khng kh mt thi gian thu c m gam hn hp rn A gm FeO, Fe2O3, Fe3O4 v Fe. Ha tan ht A trong lng d dung dch HNO3 un nng, thu c dd B v 2,24 lt kh NO duy nht (ktc). a. Vit phng trnh cc phn ng xy ra b. Tnh m. Cu 21: Oxi ha hon ton 2,184 gam bt Fe thu c 3,048 gam hn hp A gm cc oxit st. Chia hn hp A thnh 3 phn bng nhau: a. Kh hon ton phn 1 cn a lit H2 (ktc). Tnh a? b. Ha tan phn th 2 bng dung dch HNO3 long d thu c x lit NO duy nht (ktc). Tnh x c. Phn th 3 trn vi 5,4 gam bt Al ri tin hnh phn ng nhit nhm ( H =100%). Ha tan hn hp thu c sau phn ng bng dd HCl d thu c y lt kh H2 (ktc). Tnh y? Cu 22: Oxi ha chm m gam Fe trong khng kh, thu c 104,8 gam hn hp rn A gm Fe, FeO, Fe2O3 v Fe3O4. ha tan A trong dung dch HNO3 d thu c dung dch B v 12,096 lt hn hp kh X gm NO v NO2 (ktc). bit dX/He= 10,167. a. Vit cc phn ng xy ra. b. Tnh m? c. Cho dd B tc dng vi dung dch NaOH d, lc kt ta v em nung n khi lng khng i thu c cht rn D. Tnh khi lng cht rn D. Cu 23: Cho 11,36 gam hn hp gm Fe, FeO, Fe2O3 v Fe3O4 phn ng ht vi dung dch HNO3 long (d), thu c 1,344 lt kh NO (sn phm kh duy nht, ktc) v dung dch X. C cn dung dch X thu c m gam mui khan. a. Vit phng trnh cc phn ng xy ra b. Tnh gi tr ca m Cu 24: 2,52 gam bt st trong khng kh, sau mt thi gian thu c 2,84 gam hn hp X gm Fe, FeO, Fe2O3, Fe3O4. ha tan ht X cn 500 ml dung dch HNO3 aM thy sinh ra 0,56 lt NO l sn phm kh duy nht v dung dch Y. Tnh a. Cu 25: Ho tan hon ton 30,4g hn hp X gm Cu, CuS, Cu2S v S bng HNO3 d thu c 20,16 lit (ktc) kh NO duy nht v dung dch Y. Thm Ba(OH)2 vo dung dch Y thu c m gam kt ta. Tnh gi tr m lbao nhiu ? Cu 26: Nung m gam bt Cu trong oxi thu c 24,8 gam hn hp cht rn X gm Cu, CuO, Cu2O. Ho tan hon ton X bng H2SO4 c, nng thu c 4,48 lt (ktc) kh SO2 duy nht. Tnh gi tr m Cu 27: Cho 20,80 gam hn hp Fe, FeS, FeS2, S tc dng vi dung dch H2SO4 c nng d thu c V lt kh SO2 (o ktc) v dung dch A. Cho A tc dng vi dung dch NaOH d thu c 21,4 gam kt ta. Tnh th tch dung dch KMnO4 1M cn dng phn ng va vi lng kh V lt kh SO2 trn? Cu 28: Ha tan 15 gam hn hp X gm hai kim loi Mg v Al vo dung dch Y gm HNO3 v H2SO4 c thu c 0,1 mol mi kh SO2, NO, NO2, N2O. Phn trm khi lng ca Al v Mg

trong X ln lt lA. 63% v 37%.

B. 36% v 64%.

C. 50% v 50%.

D. 46% v 54%.

Cu 29: Cho m gam bt Fe vo dung dch HNO3 ly d, ta c hn hp gm hai kh NO2 v NO c VX = 8,96 lt (ktc) v t khi i vi O2 bng 1,3125. Xc nh %NO v %NO2 theo th tch trong hn hp X v khi lng m ca Fe dng? A. 25% v 75%; 1,12 gam. B. 25% v 75%; 11,2 gam.C. 35% v 65%; 11,2 gam.D. 45% v 55%; 1,12 gam. Cu 30: Chia hn hp 2 kim loi A, B c ha tr khng i thnh 2 phn bng nhau: - Phn 1 tan ht trong dung dch HCl, to ra 1,792 lt H2 (ktc). - Phn 2 nung trong oxi thu c 2,84 gam hn hp axit. Khi lng hn hp 2 kim loi trong hn hp u l: A. 2,4 gam. B. 3,12 gam. C. 2,2 gam. D. 1,8gam. Cu 31: Cho 3 kim loi Al, Fe, Cu vo 2 lt dung dch HNO3 phn ng va thu c 1,792 lt kh X (ktc) gm N2 v NO2 c t khi hi so vi He bng 9,25. Nng mol/lt HNO3 trong dung dch u l A. 0,28M. B. 1,4M. C. 1,7M. D. 1,2M. Cu 32: Cho 1,35 gam hn hp A gm Cu, Mg, Al tc dng vi HNO3 d c 1,12 lt NO v NO2 (ktc) c khilngmol trung bnh l 42,8. Tng khi lng mui nitrat sinh ra l: A. 9,65 gam B. 7,28 gam C. 4,24 gam D. 5,69 gam Cu 33: Chia 38,6 gam hn hp gm Fe v kim loi M c ha tr duy nht thnh 2 phn bng nhau: Phn 1: Tan va trong 2 lt dung dch thy thot ra 14,56 lt H2 (ktc). Phn 2: Tan hon ton trong dung dch HNO3 long nng thy thot ra 11,2 lt kh NO duy nht (ktc) 1. Nng mol/l ca dung dch HCl l:A. 0,65M. B. 1,456M. C. 0,1456M. D. 14,56M. 2. Khi lng hn hp mui clorua khan thu c l:A. 32,45 gam. B. 65,45 gam. C. 20,01gam. D. 28,9 gam. 3. % m ca Fe trong hn hp u l:A. 60%. B. 72,9%. C.58,03%. D. 18,9%. 4. Kim loi M l:A. Zn. B. Mg. C. Pb. D. Al.