C. b anot xayra sir oxi hoa: Cu > C u^^+2e
14. Khi nung 23,2 gam sunfua ciia mot kim loai hoa tri II trong khong khf, roi lam ngu6i san phiiim thu dugc m6t chat long va mot chat khị Lirong san phaim khf
ngu6i san phiiim thu dugc m6t chat long va mot chat khị Lirong san phaim khf nay lam mÁt mau dung djch c6 chiia
Ạ 25,4 gam iot. B. 12,7 gam iot. ' .
C. 38,1 gam iot. D. 50,8 gam iot.
Huang dan gidi
Khi nung sunfua kim loai trong khong khi:
MS,,, + 0,,k, > M,0«,, + SO:,k,
oxit kim loai
=> Loai trucmg hop nay \i oxit kim loai la chtft ran. MS,,) + 0 , | „ > M + SO,,,)
kim loai
=> Kim loai M athe long (khi lam ngu6i) => M la thuy ngSn (Hg), sunfua la HgS. PTPLT: HgS + O, > Hg + SO,
23.2 „ , ,
^ 0,1 mol
232
SO, + I , + 2H,0 > H,SO, + 2HI 0,1 0,1 (mol)
=> = 0,1. 254 = 25,4 (gam).
Dap an dung la A . 15. Cho lu6ng khi H , (du) qua h6n hop cac oxit CuO, FêOj, ZnO, MgO nung a
nhiet do caọ Sau phan ling h6n hop rdn con lai la
Ạ Cu, Fe, Zn, Mg. B. Cu, Fe, Zn, MgỌ C. Cu, FeO, ZnO, MgỌ D. Cu, Fe, ZnO, MgỌ
Huong dan gidi
Khi H , , 6 nhiet do cao khir duoc cac oxit ciia cac kim loai yeu (CuO), kim loai trung binh (sau Zn, nhu FêO,):
* H , + CuO — ^ Cu + H , O t 3H,,j,, + Fe,03 — ^ 2Fe + 3 H , 0 t
0
H, + ZnO — — > khong xay ra (vSn con ZnO)
, 0
MgO + H , > khong xay ra (van con MgO). Sau phan ung, trong chat rdn c6 Cu, Fe, ZnO, MgỌ
Dap an dung la C.
Cly TNHH MTV DVVH Khang Viet
16. Cho luong khf H , (du) di qua ong chiia dong thcJi 0,1 mol m6i chat sau day dot nong : MgO, Fe,04, A1,0, va ZnỌ Sau khi cac phan ung xay ra hoan toan, dan toan bo khi va hoi thu dugc qua binh dung 100 gam dung djch H2S0498% (cho rang H , du khong phan ling vdi H,vS04 dac, hoi nudrc bi háp thu het). Nong d6 % ciia dung djch H 2 S O 4 thu dugc la
Ạ 85,66% B. 91,42% C. 84,34% D. 89,9%
Huong dan gidi
Theo bai ra: n^^^sl.^^ = 98(gam)
PTPLT: Fe304 + 4H2 3Fe + 4H2O .
0,1 -> 0,4
(MgO, AUO, va ZnO khong bi H , khu)
198.100% 107,2 107,2
Dap an diing la B.
Chu v.- ZnO khong bj khu boi CO, H,/t", bj khu bai C:
. 0
Suy ra: m,, = 100 + 0,4. 18 = 107,2 (gam) ^C % H , S O 4 = =91,42%
ZnO + C—^—>Zn + CO
17. Tien lanh cac thi nghiem sau: ,
(1) CI o Zn vao dung djch AgNO,; (2) Cho Fe vao dung djch Fe,(S04),; (3) C\ Na vao dung djch C U S O 4 ; (4) Dan khi CO (du) qua bot CuO nong. Cac thi nghiem c6 tao thanh kim loai la
A . ( l ) v a ( 2 ) . B. ( l ) v a ( 4 ) . C. (3) va (4). D. (2) va (3). Huong đn gidi P T H H (1) Zn + 2AgNO, -> Zn ( N O , )^ + 2Ag i Fe f Fe2(S04), ^3FeS04 2Na + 2 H 2 O + C U S O 4 ^ Na2S04 + C u( O H ) ^ + H2 (4) CO + CuÔ>Cu + C02 Dap an dung la B.
18. Tliuc hidn cac thi nghidm sau: ,.
(a) Nhiet phan AgNOị I . ' ^ ^ i ' (b) Nung FeS, trong khong khị . , ' (c) Nhiet phan KNO,.
(d) Cho dung djch C U S O 4 vao dung djch NH, (du). . , (e) Cho Fe vao dung djch C U S O 4 .
(g) Cho Zn vao dung djch FeCl., (du).
Phdn loai va p/iirf/iii^ pliap i^icii BT Hoa hoc 12 -Cu Thanh Toan
S6' thi nghifim thu dirpc kim loai sau khi cac phan ling ket thiic la
A . 2. B. 3. C. 4.
Huong dan gidi
PTHH xay ra khi thirc hifin thi nghiem:
I 1 - ! - ^ A g 4+ N 0 2 + - 0 2 D. 5. (1): AgNO 4 F e S 2 + 1I O 2 A .0 - > 2 F e 2 0 , +8SO2 KNO ^ 2 ^ (2): (3): CUSO4 + 6 N H 3 + 2 H 2 O ^ [Cu ( N H 3 )4 ] ( O H)2 + ( N H 4 \4
Fe + CUSO4 FeS04 +Cui
Zn + 2FeCl3 (du) -> 2FeCl2 + ZnClj AgjS + O2 -> 2Ag i +SO2
Ba + CUSO4 + 2 H 2 O- > C U( 0H) 2 + BaS04 + H2
Dap an diing la B. 19. Trucmg hofp nao sau day tao ra kim loaỉ
Ạ D6't FeSj trong oxi dụ
B. Nung h6n hofp quang apatit, da xa van va than coc trong 16 dung.
C. D6't A g 2 S trong oxi dụ
D. Nung h6n hop quang photphorit, cat va than c6'c trong 16 dien.
Huong dan gidi
PTHH cac phan iJng xay ra: 4 F e S 2 + 1IO2 -> 2Fe203 + 8SO2
Quang apatit + da xa van + than c6'c phan lan nung chay
A g 2 S + O2 - » 2Ag + SO2
Ca3 (PO4 )^ + 3Si02 + 5C -> 2P + 3CaSi03 + SCO
=> Truong hop tao ra kim loai la C. Dap an dung la C.