D. Loai VI Mg(N03)3. ;^i'Vf;.-->* ^-V, v .ri C'^'
Dap an dung la B. 12. Co nam dung dich dung rieng bift trong nam dng nghiem: (NH4)2S04, Fed,,
Cr(N03)3, K2CO3, A1(N03)3. Cho dung djch BăOH)2 den dir vao nam dung dich tren. Sau khi phan ling ket thuc, s6' dng nghiem c6 ket tiia la
Ạ 5. B. 2. C.4. D.3. ,
Huong đn gidi <. i
Phan ling hoa hoc xay ra khi cho BăOH)2 toi du vao cac dung djch tren: « ' ;ị
+ BăOH), + (NH4)3S04 > B^SO.i + 2NH3t + 2H,0 * ' + Bă0H)2 + FeCU > Fe(0H)4 + BaCU
+ 3BăOH), + 2Cr(N03)3 > 2Cr(OH)3 + 3BăN03)2 2Cr(OH)3 + BăOH)2 > Ba[Cr(OH)4J. (tan)
+ BăOH), + K^COj > BaCO.i + 2K0H
+ 3BăOH). + 2A1(N03)3 > 2Al(OH)3 + 3BăN03)2 2A1(0H)3 + Bă0H)2 > BalAl(OH)4]3 (tan)
Co 3 dng nghiem c6 ket tiiạ
Dap an dung la D. 13. Hoa tan m gam hdn hop gom Al, Fe vao dung dich H2SO4 loang (du). Sau khi
cac phan dng xay ra hoan toan, thu dugc dung dich X. Cho dung djch Bă0H)2 (du) vao dung dich X, thu dugc ket tiia Ỵ Nung Y trong khong khi den khdi lirgng khong đi, thu dugc chat rdn Z la
Ạ hdn hgp gom AI2O3 va VẹOy B. hdn hgp gom BaS04 va FeỌ • C. hdn hgp gom BaS04 va FeA- t)- Fe;03.
Huong đn gidi
So đ phan ling:
Al H2S04(l)du^ AL(S04)3 Bă0H)2du BaS04i ^^^^^^
Fe(OH)24r
^ F^S04 > — > F e 2 0 3 H2SO4 du
(Y>, (Z) Vay trong Z c6 BaS04 va FejOj. Dap an dung la C.
Phdn loai va phirang phap gidi nhanh ET H6a hoc 12 - Cu Thanh Tocin
14. Chat nao sau day phan ling duoc v6i Al?
Ạ Dung djch Na2S04 B. Khi CO,
C. Dung dich HNO, dac, nguoi D. Dung dich MgCl,
' Hu&ng đn gidi ui i
^ PTPlT: 4A1 + 3 C O , — ^ 2 A l 2 0 3+ 3 C ' " '
Dap an dung la B.
Chu v:
- Khong the dung CO,; H,0;.. d^ dap tat dam chay kirn loai manh (Mg, Al,...) - Al (Cr, Fe,...) bj thu dong hoa trong HNO3 dac, ngu6ị - Al (Cr, Fe,...) bj thu dong hoa trong HNO3 dac, ngu6ị
15. Cho cac dung djch: NâCOj, NaOH, AICI3, HCl, NaHS04. N6'u tr6n cac dung djch vdri nhau tirng doi m6t thi c6 nhi6u nhát bao nhifeu phan \ing c6 san ph^m la djch vdri nhau tirng doi m6t thi c6 nhi6u nhát bao nhifeu phan \ing c6 san ph^m la chátkhỉ
Ạ 4 B. 1 C. 2 D. 3 >;
Hu&ng đn gidi
Cac phan ihig hoa hoc sinh ra chat khi:
NajCOj + 2HC1 >2NaCl + C O 2 t + H 2 O
Na2C03 + 2NaHS04 >2Na2S04 + C O 2 T+H2O
3Na2C03 + 2AICI3 + 3 H 2 O >2A1(0H)3 i +3CO2 t +6NaCl
Dap an dung la D
16. Cation M'* c6 ca'u hinh electron ngoai ciing la 2p*. Khi cho dung dich MCI3 vao cac 6'ng nghiem dung luong du cac dung djch: NâCOj, NaOH, NH3 Na2S04. S6' cac 6'ng nghiem dung luong du cac dung djch: NâCOj, NaOH, NH3 Na2S04. S6' 6'ng nghiem sau phan ling c6 kd't tiia hidroxit la
Ạ 3 B. 2 C. 4 D. 1
Hu&ng đn gidi
M^"*" CO cS'u hinh electron ngoai cung la 2p*
=> ca'u hinh electron 6iy du cua M^^ la [Ne] (ls22s^2p^).
Vi M - 3e > M"*^ Ne]3s^3p' <-[Ne
, ^ Z ^ ^ =13(Al);M-'MaAP*
PTPLT: 2AlCl3 + 3Na2C03 + H20->2Al(OH)3>l+3C02+6NaCl + 3NaCl + 3NaCl
A I C I 3 + 4 N a O H (du) -> Na[Al(OH)
A I C I 3 + 3NH3 + 3 H 2 O Al(OH)3 i + 3 N H 4 C I
A I C I 3 + Na2S04 kh6ng xay ra
Dap an dung la B. 17. H6n hop X chu-a NajO, NH4CI, NaHCO, va BaCl, c6 s6' mol m6i chat deu bang 17. H6n hop X chu-a NajO, NH4CI, NaHCO, va BaCl, c6 s6' mol m6i chat deu bang
nhaụ Cho h6n hop X vao H^O (du), dun nong, dung djch thu duoc chiia Ạ NaCl, NaOH, BaCl,. B. NaCl. Ạ NaCl, NaOH, BaCl,. B. NaCl.
C. NaOH, NaQ. D. NaCl, NaHCOj, NH4CI, Bad,.
Hu&ng đn gidi
Goi s6' mol m6i chát Ik x.
Cac PTPLT xay ra: ' ' -
Na,0 + H,0 — ^ 2NaOH *
X 2X ,?.v'i- .... :
NaHCOj + NaOH > Na,C03 + H,0 S ,,
X X X
Na,C03 + BaCl, > BaCOji + 2NaCl
X X 2x
NaOH + NH4CI > NHjt + NaCl + H,0
(2x-x) X X
Vay dung djch thu duoc chi chiia NaCl.
Dap an dung la B. 18. Thi nghiem nao sau day c6 ket tua sau phan utig? 18. Thi nghiem nao sau day c6 ket tua sau phan utig?
Ạ Cho dung djch NaOH de'n du vao dung djch Cr(N03)3.
B. Th6i CO, de'n du vao dung djch CăOH),.