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THI HC SINH GII LP 10

THI HSG NNG_2010


Cu 1: Cation M2+ c cu hnh electron phn lp ngoi cng l 3d6, anion X c cu hnh
electron phn lp ngoi cng l 3p6
a) Vit cu hnh electron nguyn t ca cc nguyn t M, X v gi tn chng.
b) Vit cc phng trnh ha hc xy ra khi cho n cht ca X ln lt tc dng vi MX2,
MBr2, MSO4, NaOH (un nng)
Cu 2: Cho 6,0 gam mu cht cha Fe3O4, Fe2O3 v cc tp cht tr. Ha tan mu vo lung d
dung dch KI trong mi trng H2SO4 (kh tt c Fe3+ thnh Fe2+) to ra dung dch A. Pha long
dung dch A n th tch 50 ml. Lng I2 c trong 10 ml dung dch A phn ng va vi 5,5
ml dung dch KOH 1,0M (sinh ra mui iotua v ioat). Ly 25 ml mu dung dch A khc, chit
tch I2, lng mui Fe2+ trong dung dch cn li phn ng va vi 3,20 ml dung dch KMnO4
1,0M trong H2SO4.
a) Vit cc phng trnh ha hc xy ra.
b) Tnh phn trm khi lng Fe3O4 v Fe2O3 trong mu ban u.
Cu 3:
1. a) Mt nguyn t R to c 4 axit trong R th hin s oxi ha +1, +3, +5, +7. Phn t
khi ca axit m R c s oxi ha +7 gp 1,9143 ln phn t khi ca axit m R c s oxi ha
+1. Xc nh cng thc phn t, vit cng thc cu to ca 4 axit v gi tn.
b) So snh tnh axit ca 4 axit, gii thch.
2. Cho dung dch cha 6,79 gam hn hp gm 2 mui KX, KY (X,Y l 2 nguyn t c trong t
nhin, hai chu k lin tip thuc nhm VIIA, s hiu ZX < ZY) vo dung dch AgNO3 d thu
c 8,61 gam kt ta. Tnh % khi lng ca KX trong hn hp.

THI HSG H TNH_2012


Cu 4: ho tan hon ton a mol mt kim loi cn mt lng va a mol H2SO4, sau phn
ng thu c 31,2 gam mui sunfat v kh X. Ton b lng kh X ny lm mt mu va
500 ml dung dch Br2 0,2M. Xc nh tn kim loi.
Cu 5: un nng hn hp X gm bt Fe v S trong iu kin khng c khng kh, thu c
hn hp rn A. Cho A tc dng vi mt lng d dung dch HCl thu c sn phm kh Y c t
khi so vi H2 l 13. Ly 2,24 lt (o iu kin tiu chun) kh Y em t chy ri cho ton b
sn phm chy i qua 100 ml dung dch H2O2 5,1% (c khi lng ring bng 1g/ml), sau
phn ng thu c dung dch B. Cc phn ng xy ra hon ton.
a) Tnh thnh phn % khi lng cc cht trong hn hp X.
b) Xc nh nng % cc cht trong dung dch B.
Cu 6: Cho m gam hn hp kim loi Ba, Na (c trn theo t l s mol 1:1) vo nc c
3,36 lt H2 (o iu kin tiu chun) v dung dch X. Cho CO2 hp th t t vo dung dch X.
V th biu din s ph thuc ca s mol kt ta theo s mol CO2 c hp th.
Cu 7:
a) Hm lng cho php ca S trong cc loi nhin liu l 0,3% theo khi lng. xc nh hm
lng ca S trong mt loi nhin liu, ngi ta ly 100 gam nhin liu v t chy hon ton,
sn phm to ra gm SO2, CO2 v hi nc. Dn ton b lng kh ny vo nc c 500 ml

dung dch (gi s ton b SO2 vo nc). Ly 10 ml dung dch ny em chun vi dung dch
KMnO4 nng 0,005M. Th tch dung dch KMnO4 cn dng l 12,5ml. Hi loi nhin liu trn
c c php s dng khng? Ti sao?
b) Ho tan hon ton mt lng oxit FexOy bng dung dch H2SO4 c nng thu c 2,24 lt SO2
(ktc). Phn dung dch em c cn c 120 gam mui khan. Vit phng trnh phn ng xy ra v
tm cng thc ca oxit FexOy.
Cu 8: Nhit phn hon ton m gam hn hp A gm KMnO4 v KClO3 thu c kh O2 v hn
hp rn B. Trong B c 0,894 gam KCl chim 8,132% khi lng hn hp B. Lng kh O 2 to ra
trn c trn vi khng kh theo t l th tch tng ng l 1:3, thu c thu c hn hp kh D.
Sau khi cho hn hp D t chy ht 0,528 gam cacbon, thu c hn hp kh E gm 3 kh, trong
c 22,92 % CO2 theo th tch. Hi m c th nhn nhng gi tr no c th tha mn iu kin
ca bi ton. Tnh % khi lng cc cht trong A ng vi gi tr ca m. (Bit khng kh c 20% th
tch O2, 80% l N2).

THI HC SINH GII


THI HSG LP 12 TNH NG THP_2012
Cu 1:
1) Hp cht A c to ra t 4 nguyn t ca 2 nguyn t X v Y. Tng s ht mang in trong
ht nhn ca cc nguyn t trong mt phn t A l 18. Nguyn t ca nguyn t Y c 4 electron
phn lp p. Xc nh cng thc ha hc ca A.
Cho 3,4 gam A tc dng ht vi hn hp dung dch gm KMnO4 v H2SO4 d. Tnh th tch kh
sinh ra (ktc).
2) Hon thnh cc phng trnh phn ng sau:
a) FexOy + H2SO4 c, nng SO2 + ? + ?
b) Al + HNO3 NO + N2O + ? + ?
Bit: 13,4 gam hn hp kh NO v N2O chim th tch bng th tch ca 0,8 gam H2 cng iu
kin.
Ch : cng iu kin (nhit v p sut), nu 2 cht c th tch bng nhau th s mol ca
chng cng bng nhau.
Cu 2: Cc cht sau phn ng c vi dung dch Ba(HCO3)2: HNO3, Ca(OH)2, Na2SO4,
KHSO4.
Hy vit cc phn ng ha hc xy ra di dng phn t v ion rt gn
Cu 3: Cho 200 ml dung dch A cha HCl 1M v HNO3 2M tc dng vi 300 ml dung dch B cha
NaOH 0,8M v KOH xM thu c dung dch C. trung ha dung dch C cn 60 ml dung dch
HCl 1M.
a) Tm gi tr ca x.
b) Tnh khi lng cht rn thu c khi c cn dung dch C.

THI HSG LP 12 TNH THA THIN HU_2007


Cu 4: Mt dung dch X gm FeSO4, H2SO4 v MSO4 c th tch 200 ml. Cho 20 ml dung dch
Y gm BaCl2 0,4M v NaOH 0,5M vo dung dch X th dung dch X va ht H2SO4. Cho thm
130ml dung dch Y na, th c mt lng kt ta. Lc ly kt ta, nung trong khng kh n
khi lng khng i c 10,155 gam cht rn v trung ha dung dch sau khi loi kt
ta phi dng 20ml dung dch HCl 0,25M.
a) Xc nh kim loi M.
b) Xc nh nng mol ca cc cht trong dung dch X.
(Bit: hiroxit ca M khng tan v khng c tnh lng tnh).

THI HSG LP 12 TNH BC NINH_2016


Cu 5: Ha tan hon ton 0,812 gam mt mu qung st gm FeO, Fe2O3 v 35% tp cht tr
trong dung dch HCl d, thu c dung dch X. Sc kh SO2 vo dung dch X, thu c dung
dch Y. Dung dch Y phn ng va vi 22,21 ml dung dch KMnO4 0,10M. Mt khc ha tan
ht 1,218 gam mu qung trn trong dung dch HCl d ri thm ngay dung dch KMnO4 0,10M
vo dung dch thu c cho n khi phn ng xy ra hon ton, th ht 15,26 ml dung dch
KMnO4 0,10M.

a)Vit phng trnh ha hc ca cc phn ng xy ra.


b) Tnh th tch kh SO2 (ktc) dng v thnh phn phn trm theo khi lng ca FeO v
Fe2O3 c trong mu qung.
Cu 6
1) Dung dch X gm Ba(OH)2 0,2M v NaOH 0,1M. Hp th hon ton V lt kh CO2 (o
ktc) vo 200 ml dung dch X, sau phn ng thu c 5,91 gam kt ta. Tnh V.
2) Ho tan 86,7 gam mt oleum X vo nc d thu c dung dch H2SO4. trung ho dung
dch H2SO4 trn cn 1,05 lt dung dch KOH 2M. Xc nh cng thc phn t ca X.

THI HSG LP 11 TNH VNH PH_2012


Cu 7: Nung 9,28 gam hn hp A gm FeCO3 v mt oxit st trong khng kh n khi lng
khng i. Sau khi phn ng xy ra hon ton, thu c 8 gam mt oxit st duy nht v kh
CO2. Hp th ht lng kh CO2 vo 300 ml dung dch Ba(OH)2 0,1M, kt thc phn ng thu
c 3,94 gam kt ta.
a) Tm cng thc ha hc ca oxit st.
b) Cho 9,28 gam hn hp A tc dng vi dung dch HCl d, sau khi cc phn ng kt thc thu
c dung dch B. Dn 448 ml kh Cl2 (ktc) vo B thu c dung dch D. Hi D ha tan c
ti a bao nhiu gam Cu?

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