Bài tập về NHÔM-CROM-KẼM

1. 4 Al + 3 C →t o Al C4 3

2. Al C4 3 +6H SO2 4 →3CH4 +2Al SO2( 4 3)

3. Al SO2( 4)3 +6NaOH vùa du →2Al OH( )3 ↓ +3Na SO2 4

4.

5. NaAlO2 + 2H O2 ‡ ˆ ˆˆ ˆ † NaOH + Al OH( )3

6. 2Al +6HCl →2AlCl3 +3H2

7. AlCl3 + 3NH3 + 3H O2  →Al OH( )3 ↓ + 3NH Cl4

8. 2Al OH( )3 →t o Al O2 3 +3H O2

10. 2Al +3S →t o Al S2 3

11. Al S2 3 + 6 H O2  → 2 Al OH ( )3 ↓ + 3 H S2 ↑

12. 2Al OH( )3 + Ba OH( )2 →Ba AlO( 2)2 +4H O2

13. 2Al Ba OH+ ( )2 +2H O2 →Ba AlO( 2)2 +3H2 ↑

2

2

o t

Al + O → Al O

15.

3 6

3 2

2

dpnc

Na AlF

Al O → Al + O

16. Al O2 3 +Ba OH( )2 →Ba AlO( 2)2 +H O2

17. 2Al + 2NaOH + 2H O2  → 2NaAlO2 + 3H2

3 6

2

Na AlF

Al O → Al + O

19. 2Al Ca OH+ ( )2 +2H O2 →Ca AlO( 2)2 +3H2 ↑

22. AlCl3 +3AgNO3 → Al NO( 3 3) +3AgCl ↓

23. 3Mg +2AlCl3 →2Al +3MgCl2

24.

2

2 Zn O + →t o 2 ZnO

Hoặc

o t

26. Na ZnO2 2 +2HCl vùa du →Zn OH( )2 ↓ +2NaCl

27.

28. Zn OH( )2 +4NH3 →Zn NH( 3) (4 OH)2

29. Zn+2NaOH →Na ZnO2 2 +H2 ↑

30. Zn+ 4NH OH4  → Zn NH( 3) (4 OH)2 +H2 ↑ + 2H O2

31. 4 Cr + 3 O2 →t o 2 Cr O2 3

32. Cr O2 3 +2NaOH →2NaCrO2 +H O2

( )

34.

35. 2Cr OH( )3 →t o Cr O2 3 +3H O2

36. Cr O2 3 +2Al →t o Al O2 3 +2Cr

37. Cr OH( )3 +3HCl →CrCl3 +3H O2

38. 2Cr+3Cl2 →t o 2CrCl3