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THI TH H & C NM 2012 (H SPHN LN 5)Mn: Ha hc.

Thi gian: 90 pht; 50 cu trc nghim.H v tn: .S bo danh: .

Cu 1: Khi iu ch C2H4 t C2H5OH v H2SO4 c 1700C th thu c kh C2H4 c ln CO2 v SO2. Nu cho hnhp kh i qua cc dung dch: KMnO4; Ca(OH)2; KCl; Br2; NaOH th s dung dch c th dng loi b CO2 v SO2

i c l ?A. 1 B. 3 C. 2 D. 4Cu 2: Mt hp cht X c mt s tnh cht nh:

1. Dung dch X lm xanh giy qu tm;2. t X trn ngn la n kh cho ngn la mu vng;3. Dung dch X tc dng c vi kh cacbonic;4. Dung dch X c th tc dng vi dung dch AlCl3 gii phng kh.Phn t khi ca X l ?A. 106 B. 84 C. 162 D. 138

Cu 3: t chy hon ton m gam hn hp X gm 2 hidrocacbon mch h, thuc cng dy ng ng ri hp thton b sn phm chy vo bnh ng dung dch Ca(OH) 2 d, to ra 14 gam kt ta, dung dch sau phn ng ckhi lng gim 6,22 gam so vi khi lng dung dch Ca(OH)2 ban u. Mt khc cho m gam hn hp X vobnh ng dung dch AgNO3/NH3 d, thu c 10,42 gam kt ta. Bit t khi hi ca X so vi H 2 nh hn 20.Thnh phn phn trm khi lng ca hidrocacbon c phn t khi ln hn trong X l ?A. 60,0% B. 40,0% C. 41,94% D. 58,06%

Cu 4: Cho 4,48 gam hn hp CH3COOC2H5 v CH3COOC6H5 (c t l mol 1:1) tc dng vi 800 ml dung dchNaOH 0,1M thu c dung dch X. C cn dung dch X th khi lng cht rn thu c l ?A. 4,88 gam B. 5,60 gam C. 6,40 gam D. 3,28 gam

Cu 5: X, Y, Z l ba kim loi trong s phn ng sau:

0 03

3 3 2 3 2 3 3

( )

3 2

3

( )

( )HNO t CO t HCl X NO X O X O XClX

Y Y NO YO Y Y

Z Z Z ZZNO

+ + +

X, Y, Z ln lt l ?

A. Al, Pb, Ag. B. Al, Cu, Hg. C. Al, Cu, Ag. D. Fe, Cu, Ag.Cu 6: Cho cc phn ng sau:

(1) Fe(OH)2 + H2SO4 c0t (2) Fe + H2SO4 long

(3) Fe(OH)3 + H2SO4 c0t (4) Fe3O4 + H2SO4 long

(5) Cu + H2SO4 long + dung dch NaNO3 (6) FeCO3 + H2SO4 c0t

S phn ng ha hc trong H2SO4 ng vai tr l cht oxi ha l ?A. 5 B. 4 C. 2 D. 3

Cu 7: Ha tan hon ton Fe3O4 trong H2SO4 long, d thu c dung dch X. Cho dung dch X ln lt phn ng vicc cht: Cu, Ag, dung dch KMnO 4, Na2CO3, AgNO3, KNO3. S trng hp c phn ng xy ra vi dung dch Xl ?A. 6 B. 3 C. 4 D. 5

Cu 8: Nhit phn hon ton hn hp rn KNO3, Cu(NO3)2, Fe(NO3)2 v AgNO3, sau phn ng thu c hn hp snphm rn gm:A. KNO2, CuO, FeO v Ag. B. K2O, CuO, Fe2O3 v Ag.C. KNO2, CuO, Fe2O3 v Ag2O. D. KNO2, CuO, Fe2O3 v Ag.

Cu 9: X l axit hu c mch h c cha 2 lin kt trong phn t. X tc dng vi NaHCO 3 thu c s mol CO2bng s mol ca X phn ng. Cng thc tng qut ca X l ?A. CnH2n 2O2 (n 3). B. CnH2nO4 (n 2).C. CnH2n 2O4 (n 2). D. CnH2nO2 (n 1).

Cu 10:Loi phn bn ha hc c tc dng kch thch cy ci sinh trng, ra nhiu l, nhiu hoa v ph hp vi ccloi t phn l ?A. NH4NO3 B. Ca(NO3)2 C. Ca(H2PO4)2 D. KCl

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Cu 11: Cho dy cc cht: (NH2)2CO, NH4Cl, (NH4)2SO4, NaHCO3, ZnCl2, FeCl2, KCl. S cht trong dy tc dng vidung dch Ba(OH)2 d to thnh kt ta sau khi cc phn ng xy ra hon ton l ?A. 2 B. 5 C. 4 D. 3

Cu 12: Cho cc polime sau y: (1) t tm; (2) si bng; (3) si ay; (4) t enang; (5) t visco; (6) nilon 6,6; (7) taxetat. S loi polime c ngun gc xenluloz l ?A. 4 B. 2 C. 5 D. 3

Cu 13: Cho cc cht sau: Al; HOOCCH2CH2CH(NH2)COOH; Al(OH)3; CrO3; ZnO; NaHCO3; H2NCH2COOCH3;CuSO4; NaHSO4. Theo Bronsted, s cht lng tnh l ?A. 7 B. 4 C. 8 D. 6

Cu 14: Dung dch cha mui X khng lm qu tm ha ; dung dch cha mui Y lm qu tm ha . Trn haidung dch ny vi nhau th va c kt ta va c kh bay ra. X v Y ln lt l hai dung dch no di y ?A. Ba(HCO3)2 v KHSO4. B. Ba(HCO3)2 v (NH4)2SO4.C. Na2SO4 v Ba(HCO3)2. D. Ba(NO3)2 v (NH4)2CO3.

Cu 15: Cho cc cht: C6H5NH3Cl (phenylamoni clorua), C6H5Cl (phenyl clorua), C2H5Cl, NaHCO3, CO, CO2,Zn(OH)2, Mg(OH)2, HF, Cl2, NH4Cl. S cht tc dng c vi dung dch NaOH long, un nng lA. 8 B. 5 C. 6 D. 7

Cu 16: Cho cc cht sau: C2H3Cl, C2H4, C2H6, C2H3COOH, C6H11NO (caprolactam), vinyl axetat, phenyl axetat. Scc cht trong dy c kh nng tham gia phn ng trng hp l ?A. 3 B. 6 C. 4 D. 5

Cu 17: Cho 14 gam bt st vo 400ml dung dch X gm: AgNO 3 0,5M v Cu(NO3)2 xM. Khuy nh cho ti khiphn ng kt thc thu c 30,4 gam cht rn Y v dung dch Z. Cho Z tc dng vi dung dch NaOH d th thu

c kt ta mt hidroxit kim loi. Gi tr ca x l ?A. 0,1 B. 0,125 C. 0,2 D. 0,15

Cu 18: Ngi ta d kin iu ch oxi theo cc qu trnh di y:1) in phn nc. 2) Phn hy H2O2 vi cht xc tc MnO2.3) in phn dung dch CuSO4. 4) Chng ct phn on khng kh lng.5) in phn dung dch NaOH. 6) Nhit phn KClO3 vi xc tc MnO2.S qu trnh thng p dng iu ch O2 trong phng th nghim l ?A. 3 B. 2 C. 4 D. 5

Cu 19: un nng 34,2 gam mantoz trong dung dch axit sunfuric long. Trung ha dung dch thu c sau phnng bng dung dch NaOH ri cho tc dng hon ton vi dung dch AgNO 3/NH3 d, un nng thu c 37,8gam Ag. Hiu sut ca phn ng thy phn mantozA. 87,5% B. 69,27% C. 62,5% D. 75,0%

Cu 20: Cho cn bng ha hc sau: CaCO3 (r ) CaO (r ) + CO2 (k) 0H >Trong cc yu t: (1) tng nhit ; (2) thm mt lng CaCO 3; (3) ly bt CO2 ra; (4) tng p sut chung ca h.S yu t lm thay i cn bng ca h l ?A. 3 B. 4 C. 2 D. 1

Cu 21: Dy gm cc cht trong phn t ch cha mt loi lin kt l ?A. HF, HClO, KF, H2O. B. NaF, Na2O, CaCl2, KBr.C. NaF, NaCl, NaNO3, KI. D. HF, H2S, HCl, NH4NO3.

Cu 22: Cho 13,92 gam Fe3O4 tc dng hon ton vi dung dch HNO3, sau phn ng thu c dung dch X v 0,448lt kh NxOy (sn phm kh duy nht ktc). Khi lng HNO3 nguyn cht tham gia phn ng l ?A. 12,4 gam B. 17,64 gam C. 35,28 gam D. 33,48 gam

Cu 23: Cho 12,55 gam mui CH3CH(NH3Cl)COOH tc dng vi 150 ml dung dch Ba(OH)2 1M. C cn dung dchsau phn ng thu c m gam cht rn. Gi tr ca m l ?A. 18,95 gam B. 26,05 gam C. 34,60 gam D. 36,40 gam

Cu 24: Cho m gam hn hp Y gm axit axetic, phenol, ancol etylic tc dng va vi Na thu c 19,6 gam hnhp mui X. t chy hon ton X thu c 10,6 gam mui cacbonat. Nu cho 30,4 gam hn hp Y trn tc dngvi Na d th thu c V lt H2 (ktc). Gi tr ca V l ?A. 6,72 lt B. 4,48 lt C. 9,68 lt D. 3,36 lt

Cu 25: Cho hn hp X gm Zn, Fe vo dung dch cha AgNO 3 v Cu(NO3)2, sau phn ng thu c hn hp Ygm 2 kim loi v dung dch Z. Cho NaOH d vo dung dch Z thu c kt ta gm hai hidroxit kim loi. Dungdch Z cha ?A. Zn(NO3)2, AgNO3, Fe(NO3)3. B. Zn(NO3)2, Fe(NO3)2.C. Zn(NO3)2, Fe(NO3)2, Cu(NO3)2. D. Zn(NO3)2, Cu(NO3)2, Fe(NO3)3.

Cu 26: X l mt andehit mch h. tc dng hon ton vi V lt hi X cn ti a 3V lt H 2 (Ni, t0) thu c chthu c Y. Cho ton b Y tc dng vi Na d thu c V lt H 2. Mt khc t chy hon ton m gam X thu c

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44 gam CO2 v 9 gam H2O. Bit cc phn ng xy ra hon ton, cc th tch kh o cng iu kin. Cng thcca X v gi tr ca m l ?A. OHC HC=CH CHO v 21,0 gam. B. OHC CH2 CH2 CHO v 21,5 gam.C. CH3 C C CHO v 17,0 gam. D. OHC C C CHO v 20,5 gam.

Cu 27: X, Y, Z l cc hp cht v c ca mt kim loi, khi t nng nhit cao u cho ngn la mu vng,bit:

X + Y Z (1) Y0

t Z + H2O + E (2)

E + X Y (3) E + X Z (4)

Bit E l hp cht ca cacbon. X, Y, Z, E ln lt l ?A. KOH, KHCO3, CO2, K2CO3. B. NaOH, Na2CO3, CO2, NaHCO3.C. NaOH, NaHCO3, Na2CO3, CO2. D. NaOH, Na2CO3, NaHCO3, CO2.

Cu 28: Hn hp gm hidrocacbon X v oxi c t l mol tng ng l 1:10. t chy hon ton hn hp trn thuc hn hp kh Y. Cho Y qua dung dch H2SO4 c, thu c hn hp kh Z c t khi i vi hidro bng 19.S ng phn cu to ca X c kh nng lm mt mu dung dch brom l ?A. 5 B. 6 C. 4 D. 3

Cu 29: Cho 2,76 gam cht hu c X gm C, H, O tc dng vi dung dch NaOH va sau chng kh th phnbay hi ch c nc v cn li 2 mui ca Na c khi lng 4,44 gam. Nung nng 2 mui ny trong oxi d, phnng hon ton thu c 2,464 lt CO2 (ktc); 3,18 gam Na2CO3 v 0,9 gam H2O. Bit cng thc phn t ca Xtrng vi cng thc n gin nht. X l ?A. HO C6H4 COOH. B. HCOO C6H4 OH.

C. HO C6H4 COOCH3. D. CH3COO C6H4 OH.Cu 30: Trn 21,6 gam bt nhm vi m gam hn hp X (gm FeO, Fe 2O3 v Fe3O4) c hn hp Y. Nung Y nhit cao trong iu kin khng c khng kh n phn ng hon ton thu c hn hp rn Z. Cho Z tc dngvi dung dch NaOH d thu c 6,72 lt kh. Nu cho Z tc dng vi dung dch HNO 3 long, d th thu c19,04 lt NO (sn phm kh duy nht). Bit cc th tch kh o ktc. Gi tr ca m l ?A. 50,8 gam B. 58,6 gam C. 46,0 gam D. 62,0 gam

Cu 31: Cho 7,8 gam kali tc dng vi 1 lt dung dch HCl 0,1M sau phn ng thu c dung dch X v V lt H 2(ktc). C cn dung dch X thu c m gam cht rn khan. Gi tr ca V v m ln lt l ?A. 2,24 v 7,45 B. 2,24 v 13,05 C. 1,12 v 11,35 D. 1,12 v 3,725

Cu 32: Cho cc thuc th sau: (1) dung dch Ca(OH)2; (2) dung dch Br2; (3) dung dch KMnO4; (4) dung dch H2S;(5) dung dch NaOH; (6) dung dch BaCl2. S thuc th c th dng phn bit 2 kh CO2 v SO2 lA. 4 B. 2 C. 3 D. 5

Cu 33: Hp th hon ton V lt CO2 (ktc) vo bnh ng 200 ml dung dch X (NaOH 1M v Na2CO3 0,5M). Kttinh dung dch thu c sau phn ng (ch lm bay hi nc) th thu c 19,9 gam cht rn khan. Gi tr ca V l?A. 2,24 lt. B. 3,36 lt. C. 5,6 lt. D. 1,12 lt.

Cu 34: t chy hon ton m gam hn hp Z gm hai axit cacboxylic X v Y k tip nhau trong dy ng ng(MX > MY) cn ti thiu 14,784 lt O2 (ktc). Sn phm chy cho hp th ht vo bnh ng dung dch Ca(OH) 2 dthu c 60 gam kt ta v khi lng dung dch thu c sau phn ng gim 22,8 gam so vi dung dchCa(OH)2 ban u. Thnh phn phn trm khi lng ca X trong Z l ?A. 50,0% B. 55,22% C. 44,78% D. 56,32%

Cu 35: Cho cc dung dch: Fe(NO3)3 + AgNO3; FeCl3; CuCl2; HCl; CuCl2 + HCl; ZnCl2. Nhng vo mi dung dchmt thanh st. S trng hp c th xy ra n mn in ha l ?A. 3 B. 4 C. 5 D. 2

Cu 36: Hp cht thm X c phn trm khi lng cc nguyn t: 67,742% C; 6,451% H; cn li l oxi. T khi hica X i vi H2 nh hn 100. Cho 18,6 gam X phn ng vi dung dch cha 0,3 mol NaOH th thy va . Scng thc cu to ph hp ca X l ?A. 7 B. 5 C. 3 D. 6

Cu 37: Ha tan hon ton hn hp X gm Mg, Zn trong bnh ng a mol HNO3 thu c hn hp kh Y (gm bmol NO v c mol N2O) v dung dch Z (khng cha mui amoni). Thm V lt dung dch NaOH 1M vo dung dchZ th thu c lng kt ta ln nht. Biu thc lin h gia V vi a, b v c l ?A. V = a b 2c. B. V = a b c. C. V = a + 3b + 8c. D. V = a + 4b + 10c.

Cu 38: Cho 13,6 gam hn hp bt X (gm Fe v Mg) vo 200 ml dung dch CuSO4 1M. Sau khi phn ng kt thcthu c cht rn Y v dung dch Z. Cho cht rn Y tc dng vi dung dch HCl (d) thu c 2,24 lt H 2 ( ktc).Cho NaOH d vo dung dch Z thu c kt ta hai hidroxit kim loi. Phn trm khi lng ca Fe c trong X lA. 66,67% B. 82,35% C. 58,82% D. 17,65%

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Cu 39: Hp th hon ton 10,8 gam hn hp (gm CO2 v SO2) c t khi hi so vi H2 bng 27 vo 2 lt dung dchBa(OH)2 0,075M c kt ta v dung dch Y. Bit khi hai kh to ra kt ta hay ha tan kt ta u c hiu sutphn ng l nh nhau. Khi lng dung dch Y so vi khi lng Ba(OH)2 ban u l ?A. Tng 9,9 gam. B. Tng 10,8 gam. C. Gim 20,7 gam. D. Gim 9,9 gam.

Cu 40: C bao nhiu nguyn t ha hc m nguyn t c s th t 20 c 2 electron c thn lp ngoi cng ?A. 5 B. 2 C. 3 D. 4

Cu 41: Cho 4,06 gam andehit X, mch h tc dng vi lng d dung dch AgNO 3/NH3. Ton b lng Ag thuc cho tc dng ht vi dung dch HNO 3 c, nng, d thu c 3,248 lt kh (ktc). Mt khc cho 4,06 gam Xtc dng vi H2 d (Ni, t0) thu c m gam cht hu c Y (Bit cc phn ng xy ra hon ton, t khi hi ca Xso vi N2 nh hn 4). Gi tr ca m l ?A. 4,205 B. 4,2 C. 4,35 D. 8,7

Cu 42: Cho 0,46 gam Na vo 200 gam dung dch gim n (cha 0,42% CH 3COOH). Sau khi kt thc phn ng,em c cn dung dch thu c m gam cht rn. Gi tr ca m l ?A. 0,8 gam B. 1,388 gam C. 1,286 gam D. 1,148 gam

Cu 43: Cho Cu vo dung dch FeCl3; H2S vo dung dch CuSO4; HI vo dung dch FeCl3; dung dch AgNO3 vodung dch Fe(NO3)3; dung dch HCl vo dung dch Fe(NO3)2. S cp cht phn ng c vi nhau l ?A. 5 B. 3 C. 2 D. 4

Cu 44: Cho cc dung dch c cng nng : CH 3COONa (1), H2SO4 (2), HCl (3), NaNO3 (4). Gi tr pH ca ccdung dch c sp xp theo chiu tng t tri sang phi l ?A. (3), (2), (4), (1). B. (1), (2), (3), (4). C. (4), (1), (2), (3). D. (2), (3), (4), (1).

Cu 45: Ha tan hon ton m gam hn hp gm FeS2 v Cu2S vo dung dch axit HNO3 sau phn ng thu c dung

dch X (ch cha hai cht tan) vi tng khi lng l 43,2 gam. Gi tr ca m l ?A. 24,0 gam B. 26,4 gam C. 7,84 gam D. 33,6 gam

Cu 46: t chy hon ton mt ancol X th s mol CO2 thu c bng 75% s mol H2O to thnh; tng s mol CO2v H2O bng 14/9 ln tng s mol X v O2 phn ng. Cho 6,9 gam X tc dng vi Na d th thu c V lt H 2(ktc). Gi tr ca V l ?A. 1,12 lt. B. 2,52 lt. C. 1,288 lt. D. 1,68 lt.

Cu 47: un nng dung dch cha 18 gam hn hp glucoz v fructoz vi lng d Cu(OH) 2 trong mi trngkim ti khi phn ng hon ton thu c m gam kt ta Cu2O. Gi tr ca m l ?A. 3,60 gam. B. 14,4 gam. C. 5,40 gam. D. 7,20 gam.

Cu 48: Cho cc dung dch: HCl , FeCl3, H2SO4, NaHSO4, CH3COOH, Na2CO3, HNO2. S lng dung dch tc dngc vi dung dch metylamin l ?A. 5 B. 4 C. 6 D. 3

Cu 49: Nhit phn hon ton hn hp gm Cu(NO3)2 + AgNO3 thu c hn hp kh c t khi so vi H 2 bng21,25. Phn trm khi lng ca Cu(NO3)2 trong hn hp l ?A. 72,6% B. 61,5% C. 52,5% D. 58,4%

Cu 50: Tc nhn ch yu gy ma axit l ?A. CO v CO2 B. CH4 v NH3 C. SO2 v NO2 D. CO v CH4

Cu 51: Cho 50 ml dung dch X cha 3,51 gam hn hp saccaroz v glucoz phn ng vi lng d AgNO 3 trongdung dch NH3, thu c 2,16 gam Ag. un nng 100 ml dung dch X vi 100 ml dung dch H 2SO4 0,05M chon khi phn ng hon ton thu c dung dch Y, gi thit th tch dung dch khng thay i. Nng mol/ltca glucoz c trong dung dch Y l ?A. 0,10M B. 0,25M C. 0,20M D. 0,15M

Cu 52: X, Y l 2 andehit no c cng s nguyn t C trong phn t. t chy hon ton 13 gam hn hp ( X v Y)thu c 0,6 mol CO2 v 0,5 mol H2O. Xc nh X, Y v tnh % khi lng ca mi cht trong hn hp.

A. C2H5CHO: 44,6% v CH2(CHO)2: 55,4%. B. CH3CHO: 35% v (CHO)2: 65%.C. C2H5CHO: 43% v CH2(CHO)2: 57%. D. C2H5(CHO)2: 65% v CH3CH(CHO)2: 35%.

Cu 53: Xt cn bng ha hc ca mt s phn ng:

1) Fe2O3(r ) + 3CO(k) 2Fe (r ) + 3CO2 (k) 2) CaO (r ) + CO2 (k) CaCO3(r )

3) N2O4 (k) 2NO2 (k) 4) H2 (k) + I2 (k) 2HI (k)

5) 2SO2 (k) + O2 (k) 2SO3 (k)

Khi tng p sut, cn bng ha hc b dch chuyn cc h:A. 1; 3; 4; 5 B. 1; 2; 4; 5 C. 2; 3; 5 D. 1; 2; 3; 4; 5

Cu 54: em nung 66,2 gam Pb(NO3)2 mt thi gian thu c 53,24 gam cht rn v V lt kh ( ktc). Gi tr ca Vv hiu sut phn ng nhit phn ln lt lA. 6,72 v 60,00%. B. 9,01 v 80,42%. C. 6,72 v 50,00%. D. 4,48 v 60,00%.

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Cu 55: Hin tng no di y c m t khngng ?A. Thi kh NH3 qua CrO3 un nng thy cht rn chuyn t mu thm sang mu lc thm.B. Nung Cr(OH)2 trong khng kh n khi lng khng i thu c cht rn mu en.C. un nng S vi K2Cr2O7 thy cht rn chuyn t mu da cam sang mu lc thm.D. t CrO trong khng kh thy cht rn chuyn t mu en sang mu lc thm.

Cu 56: nh gi s nhim kim loi nng trong nc thi ca mt nh my, ngi ta ly mt t nc, c c rithm dung dch Na2S vo thy xut hin kt ta mu vng. Hin trn chng t nc thi b nhim bi ionA. Pb2+ B. Fe2+ C. Cu2+ D. Cd2+

Cu 57: Ha hi 31,04 gam hn hp gm mt axit no, n chc X v mt axit no, a chc Y ( Y c mch cacbonkhng phn nhnh) v s mol ca X ln hn Y, thu c mt th tch hi bng th tch ca 11,2 gam N 2 (o cng iu kin nhit v p sut). Nu t chy ton b hn hp hai axit trn th thu c 42,24 gam CO 2.Thnh phn phn trm khi lng ca X trong hn hp ban u bng:A. 46,39% B. 35,25% C. 65,15% D. 55,25%

Cu 58: Khi thy phn hon ton 0,1 mol peptit X mch h (X to bi t cc amino axit c mt nhm amino v mtnhm cacboxylic) bng lng dung dch NaOH gp i lng cn phn ng, c cn dung dch thu c hn hpcht rn tng so vi khi lng X l 78,2 gam. S lin kt peptit trong X l ?A. 9 B. 10 C. 18 D. 20

Cu 59: Cho bit 2 2 2 20 0 0 0

/ / / /2,37 ; 0,76 ; 0,13 ; 0,34 .

Mg Mg Zn Zn Pb Pb Cu CuE V E V E V E V

+ + + += = = = + Pin in ha c

sut in ng chun bng 0,63V c cu to bi hai cp oxi ha kh :A. Pb2+/Pb v Cu2+/Cu. B. Zn2+/Zn v Pb2+/Pb.

C. Zn2+/Zn vaf Cu2+/Cu. D. Mg2+/Mg v Zn2+/Zn.Cu 60: Hn hp X gm 2 ancol c cng s nguyn t cacbon. Cho 0,30 mol hn hp X tc dng vi Na (d) thuc 4,48 lt kh H2 ( ktc). Mt khc t chy hon ton 0,15 mol hn hp X thu c 13,44 lt kh CO2 ( 00C;0,50 atm). Thnh phn phn trm khi lng ancol c khi lng t hn trong hn hp X l ?A. 59,74% B. 40,25% C. 59,75% D. 40,26%