can bang pu oxi hoa khu

Cân bằng phản ứng oxi hóa khử theo phương pháp điện tử
(phương pháp electron)
Hóa Vô Cơ
1. FeSO
4
+ KMnO
4
+ H
2
SO
4
 Fe
2
(SO
4
)
3
+ MnSO
4
+ K
2
SO
4
+ H
2
O
2. FeS
2
+ HNO
3
+ HCl  FeCl

3
+ H
2
SO
4
+ NO + H
2
O
3. FeS
2
+ HNO
3
 Fe(NO
3
)
3
+ H
2
SO
4
+ NO
2

↑
+ H
2
O
4. FeS
2
+ KNO

3
 KNO
2
+ Fe
2
O
3
+ SO
3
5. FeS + HNO
3
 Fe(NO
3
)
3
+ Fe
2
(SO
4
)
3
+ NO + H
2
O
6. Zn + HNO
3
 Zn(NO
3
)
2

+ N
2
O + NO + NH
4
NO
3
+ H
2
O
7. Ca
3
(PO
4
)
2
+ Cl
2
+ C  POCl
3
+ CO + CaCl
2
8. CuFeS
2
+ Fe
2
(SO
4
)
3
+ O

2
+ H
2
O  CuSO
4
+ FeSO
4
+ H
2
SO
4
9. FeCu
2
S
2
+ O
2
 Fe
2
O
3
+ CuO + SO
2
10. CuFeS
2
+ O
2
 Cu
2
S + Fe

2
O
3
+ SO
2
11. CrI
3
+ Cl
2
+ KOH  K
2
CrO
4
+ KIO
4
+ KCl + H
2
O
12. As
2
S
3
+ HNO
3
+ H
2
O  H
3
AsO
4

+ H
2
SO
4
+ NO
13. P + NH
4
ClO
4
 H
3
PO
4
+ N
2
+ Cl
2
+ H
2
O
14. Cl
2
+ KOH  KCl + KClO
3
+ H
2
O
15. S + KOH  K
2
S + K

2
SO
3
+ H
2
O
16. Al + NaNO
3
+ NaOH  Na
3
AlO
3
+ NH
3
+ H
2
O
17. Mg + H
2
SO
4
 MgSO
4
+ H
2
S + H
2
O
18. Mg + HNO
3

 Mg(NO
3
)
2
+ NH
4
NO
3
+ H
2
O
19. K
2
MnO
4
+ H
2
O  MnO
2
+ KMnO
4
+ KOH
20. NaBr + NaBrO
3
+ H
2
SO
4
 Br
2

+ Na
2
SO
4
+ H
2
O
21. K
2
Cr
2
O
7
+ FeSO
4
+ H
2
SO
4
 K
2
SO
4
+ Cr
2
(SO
4
)
3
+ Fe

2
(SO
4
)
3
+ H
2
O
22. Fe + KNO
3
 Fe
2
O
3
+ N
2
+ K
2
O
23. Al + Fe
3
O
4
 Al
2
O
3
+ Fe
24. MnO
2

+ HCl  MnCl
2
+ Cl
2
+ H
2
O
25. KMnO
4
+ HCl  KCl + MnCl
2
+ Cl
2
+ H
2
O
26. KMnO
4
+ KCl + H
2
SO
4
 MnSO
4
+ K
2
SO
4
+ Cl
2

+ H
2
O
27. KMnO
4
+ H
2
O
2
+ H
2
SO
4
 MnSO
4
+ O
2
+ K
2
SO
4
+ H
2
O
28. KMnO
4
+ KNO
2
+ H
2

SO
4
 MnSO
4
+ KNO
3
+ K
2
SO
4
+ H
2
O
29. KMnO
4
+ K
2
SO
3
+ H
2
O  MnO
2
+ K
2
SO
4
+ KOH
30. MnSO
4

+ NH
3
+ H
2
O
2
 MnO
2

↓
+ (NH
4
)
2
SO
4
+ H
2
O
31. Ca
3
(PO
4
)
2
+ SiO
2
+ C
→
0

t
P
4
+ CaSiO
3
+ CO
↑
32. KClO
3
+ NH
3
 KNO
3
+ KCl + Cl
2
+ H
2
O
33. Zn + HNO
3
 Zn(NO
3
)
2
+ NH
4
NO
3
+ H
2

O
34. FeO + H
2
SO
4 đn
 Fe
2
(SO
4
)
3
+ SO
2

↑
+ H
2
O
35. NO
2
+ KOH  KNO
3
+ KNO
2
+ H
2
O
36. Ca(ClO)
2
+ 4HCl  CaCl

2
+ 2Cl
2

↑
+ 2H
2
O
37. Fe
3
O
4
+ H
2
SO
4
 Fe
2
(SO
4
)
3
+ SO
2

↑
+ H
2
O
38. Fe

3
O
4
+ HNO
3
 Fe(NO
3
)
3
+ NO
↑
+ H
2
O
39. Fe + Fe
2
(SO
4
)
3
 FeSO
4
40. Fe
3
O
4
+ Cl
2
+ H
2

SO
4
 Fe
2
(SO
4
)
3
+ HCl + H
2
O
41. FeSO
4
+ Cl
2
+ H
2
SO
4
 Fe
2
(SO
4
)
3
+ HCl
1
42. Fe
x
O

y
+ HNO
3
 Fe(NO
3
)
3
+ NO

+ H
2
O
43. Fe
x
O
y
+ CO  Fe
n
O
m
+ CO
2
44. Fe
x
O
y
+ H
2
SO
4

 Fe
2
(SO
4
)
3
+ SO
2

↑
+ H
2
O
45. FeCl
3
+ KI  I
2
+ FeCl
2
+ KCl
46. FeCl
3
+ HI  I
2
+ FeCl
2
+ HCl
47. Fe
2
(SO

4
)
3
+ SO
2
+ H
2
O  FeSO
4
+ H
2
SO
4
48. M
x
O
y
+ HNO
3
 M(NO
3
)
n
+ NO + H
2
O
49. M + HNO
3
 M(NO
3

)
n
+ NO + H
2
O
50. M + HNO
3
 M(NO
3
)
n
+ N
2
O + H
2
O
51. M + HNO
3
 M(NO
3
)
n
+ NH
4
NO
3
+ H
2
O
52. FeSO

4
+ HNO
3
 Fe(NO
3
)
3
+ H
2
SO
4
+ NO
↑
+ H
2
O
53. FeSO
4
+ HNO
3
 Fe(NO
3
)
3
+ Fe
2
(SO
4
)
3

+ NO
↑
+ H
2
O
54. CrCl
3
+ Br
2
+ NaOH  Na
2
CrO
4
+ NaBr + NaCl + H
2
O
55. Cu + HNO
3
 Cu(NO
3
)
2
+ NO
2

↑
+ H
2
O
56. KBrO

3
+ KBr + H
2
SO
4
 K
2
SO
4
+ Br
2
+ H
2
O
57. As
2
S
3
+ HNO
3
+ H
2
O  H
3
AsO
4
+ H
2
SO
4

+ NO
58. NaCrO
2
+ Br
2
+ NaOH  Na
2
CrO
4
+ NaBr + H
2
O
Hóa Hữu Cơ
59. C
6
H
5
OH + O
2
 CO
2
+ H
2
O
60. C
6
H
12
O
6

+ KMnO
4
+ H
2
SO
4
 K
2
SO
4
+ MnSO
4
+ CO
2
+ H
2
O
61. C
2
H
5
OH + K
2
Cr
2
O
7
+ H
2
SO

4
 CH
3
CHO + Cr
2
(SO
4
)
3
+ K
2
SO
4
+ H
2
O
62. CH
3
CH
2
OH + KMnO
4
+ H
2
SO
4
 + K
2
SO
4

+ MnSO
4
+ H
2
O
63. C
6
H
5
NO
2
+ Fe + H
2
O  C
6
H
5
NH
2
+ Fe
3
SO
4

64. CH
3
-CH=CH
2
+ KMnO
4


2
||
3
HCHCCH −−
+ MnO
2
+ 2 KOH
65. + KMnO
4
+ KOH  CH
3
-COOK + MnO
2
+ K
2
CO
3
+ H
2
O
66.

+ KMnO
4
+ H
2
O  CH
3
-COOH + CO

2
+ MnO
2
+ KOH
67. CH
3
-CH
2
-OH + I
2
+ NaOH  CH
3
I + HCOONa + NaI + H
2
O
68. MnO
2
+ HOOC-COOH + H
2
SO
4
 MnSO
4
+ CO
2
+ H
2
O
69. KMnO
4

+ HOOC-COOH + H
2
SO
4
 K
2
SO
4
+ MnSO
4
+ CO
2
+ H
2
O
70. C
12
H
22
O
11
+ H
2
SO
4
 CO
2

↑
+ SO

2

↑
+ H
2
O
2
OH OH
Đáp án: Cân bằng phản ứng oxi hóa khử theo phương pháp điện tử
(phương pháp electron)
Hóa Vô Cơ
1. 10 FeSO
4
+ 2 KMnO
4
+ 8 H
2
SO
4
 5 Fe
2
(SO
4
)
3
+ 2 MnSO
4
+ K
2
SO

4
+ 8 H
2
O
2. FeS
2
+ 5 HNO
3
+ 3 HCl  FeCl
3
+ 2 H
2
SO
4
+ 5 NO + 2 H
2
O
3. FeS
2
+ 18 HNO
3
 Fe(NO
3
)
3
+ 2 H
2
SO
4
+ 15 NO

2

↑
+ 7 H
2
O
4. 2FeS
2
+ 15 KNO
3
 15 KNO
2
+ Fe
2
O
3
+ 4 SO
3
5. 3FeS + 12 HNO
3
 Fe(NO
3
)
3
+ Fe
2
(SO
4
)
3

+ 9 NO + 6 H
2
O
6. 19Zn + 48HNO
3
 19 Zn(NO
3
)
2
+ 2N
2
O + 2 NO + 2 NH
4
NO
3
+ 20 H
2
O
7. Ca
3
(PO
4
)
2
+ 6Cl
2
+ 6 C  2POCl
3
+ 6 CO + 3 CaCl
2

8. 3CuFeS
2
+ 8 Fe
2
(SO
4
)
3
+ 8 O
2
+ 8 H
2
O  3CuSO
4
+ 19 FeSO
4
+ 8H
2
SO
4
9. 4FeCu
2
S
2
+ 15 O
2
 2Fe
2
O
3

+ 8 CuO + 8SO
2
10. 4CuFeS
2
+ 9 O
2
 2Cu
2
S + 2 Fe
2
O
3
+ 6 SO
2
11. 2CrI
3
+ 27Cl
2
+ 64 KOH  2K
2
CrO
4
+ 6KIO
4
+ 54 KCl + 32H
2
O
12. 3As
2
S

3
+ 28HNO
3
+ 4 H
2
O  6 H
3
AsO
4
+ 9 H
2
SO
4
+ 28NO
13. 8P + 10NH
4
ClO
4
 8H
3
PO
4
+ 5 N
2
+ 5 Cl
2
+ 8 H
2
O
14. 3Cl

2
+ 6 KOH  5KCl + KClO
3
+ 3 H
2
O
15. 3S + 6KOH  2K
2
S + K
2
SO
3
+ 3H
2
O
16. 3Al + 3 NaNO
3
+ 21 NaOH  8 Na
3
AlO
3
+ 3 NH
3
+ 6 H
2
O
17. 4Mg + 5H
2
SO
4

 4 MgSO
4
+ H
2
S + 4 H
2
O
18. 4Mg + 10HNO
3
 4Mg(NO
3
)
2
+ NH
4
NO
3
+ 3 H
2
O
19. 3K
2
MnO
4
+ 2H
2
O  MnO
2
+ 2 KMnO
4

+ 4 KOH
20. 5NaBr + NaBrO
3
+ 3 H
2
SO
4
 3Br
2
+ 3 Na
2
SO
4
+ 3 H
2
O
21. K
2
Cr
2
O
7
+ 6 FeSO
4
+ 7 H
2
SO
4
 K
2

SO
4
+ Cr
2
(SO
4
)
3
+ 3Fe
2
(SO
4
)
3
+ 7 H
2
O
22. 10Fe + 6 KNO
3
 5 Fe
2
O
3
+ 3N
2
+ 3 K
2
O
23. 8Al + 3Fe
3

O
4
 4 Al
2
O
3
+ 9Fe
24. MnO
2
+ 4 HCl  MnCl
2
+ Cl
2
+ 2 H
2
O
25. 2KMnO
4
+ 16 HCl  2KCl + 2MnCl
2
+ 5Cl
2
+ 8 H
2
O
26. 2KMnO
4
+ 10KCl + 8H
2
SO

4
 2 MnSO
4
+ 6 K
2
SO
4
+ 5 Cl
2
+ 8 H
2
O
27. 2KMnO
4
+ 5H
2
O
2
+ 3H
2
SO
4
 2 MnSO
4
+ 5 O
2
+ K
2
SO
4

+ 8H
2
O
28. 2KMnO
4
+ 5 KNO
2
+ 3 H
2
SO
4
 2 MnSO
4
+ 5 KNO
3
+ K
2
SO
4
+ 3 H
2
O
29. 2KMnO
4
+ 3K
2
SO
3
+ H
2

O  2MnO
2
+ 3 K
2
SO
4
+ 2KOH
30. MnSO
4
+ 2 NH
3
+ 2 H
2
O
2
 MnO
2

↓
+ (NH
4
)
2
SO
4
+ 2 H
2
O
31. 2Ca
3

(PO
4
)
2
+ 6 SiO
2
+ 10 C
→
0
t
P
4
+ 6 CaSiO
3
+ 10 CO
↑
32. 3KClO
3
+ 2 NH
3
 2 KNO
3
+ KCl + Cl
2
+ 3 H
2
O
33. 4Zn + 10 HNO
3
 4Zn(NO

3
)
2
+ NH
4
NO
3
+ 3H
2
O
34. 2FeO + 4H
2
SO
4 đn
 Fe
2
(SO
4
)
3
+ SO
2

↑
+ 4 H
2
O
35. 2NO
2
+ 2KOH  KNO

3
+ KNO
2
+ H
2
O
36. Ca(ClO)
2
+ 4HCl  CaCl
2
+ 2Cl
2

↑
+ 2H
2
O
37. 2Fe
3
O
4
+ 10H
2
SO
4
 3 Fe
2
(SO
4
)

3
+ SO
2

↑
+ 10 H
2
O
38. 3Fe
3
O
4
+ 28HNO
3
 9Fe(NO
3
)
3
+ NO
↑
+ 14H
2
O
39. Fe + Fe
2
(SO
4
)
3
 3FeSO

4
40. 2Fe
3
O
4
+ Cl
2
+ 9 H
2
SO
4
 3Fe
2
(SO
4
)
3
+ 2HCl + 8 H
2
O
41. 2FeSO
4
+ Cl
2
+ H
2
SO
4
 Fe
2

(SO
4
)
3
+ 2 HCl
3
42. 3Fe
x
O
y
+ (12x-2y)HNO
3
 3x Fe(NO
3
)
3
+ (3x-2y) NO

+ (6x-y) H
2
O
43. nFe
x
O
y
+ (ny-mx) CO  x Fe
n
O
m
+ (ny-mx) CO

2
44. 2Fe
x
O
y
+ (6x-2y)H
2
SO
4
 x Fe
2
(SO
4
)
3
+ (3x-2y) SO
2

↑
+ (6x-2y) H
2
O
45. 2FeCl
3
+ 2 KI  I
2
+ 2 FeCl
2
+2KCl
46. 2FeCl

3
+ 2HI  I
2
+ 2 FeCl
2
+ 2HCl
47. Fe
2
(SO
4
)
3
+ SO
2
+ 2 H
2
O  2 FeSO
4
+ 2 H
2
SO
4
48. 3M
x
O
y
+ (4nx-2y) HNO
3
 3xM(NO
3

)
n
+ (nx-2y) NO + (2nx-y)H
2
O
49. 3M + 4n HNO
3
 3 M(NO
3
)
n
+ n N
2
O + 2n H
2
O
50. 8M + 10n HNO
3
 8 M(NO
3
)
n
+ n N
2
O + 5n H
2
O
51. 8M + 10nHNO
3
 8 M(NO

3
)
n
+ n NH
4
NO
3
+3n H
2
O
52. 3FeSO
4
+ 4 HNO
3
 Fe(NO
3
)
3
+ Fe
2
(SO
4
)
3
+ NO
↑
+ 2 H
2
O
53. 8FeSO

4
+ 10 HNO
3
 3Fe(NO
3
)
3
+3H
2
SO
4
+ NO
↑
+ 2 H
2
O
54. 2CrCl
3
+ 3Br
2
+ 16NaOH  2 Na
2
CrO
4
+ 6 NaBr + 6 NaCl + 8 H
2
O
55. Cu + 4HNO
3
 Cu(NO

3
)
2
+ 2 NO
2

↑
+ 2 H
2
O
56. KBrO
3
+ 5 KBr + 3 H
2
SO
4
 3K
2
SO
4
+ 3 Br
2
+ 3 H
2
O
57. 3As
2
S
3
+ 28 HNO

3
+ 4H
2
O  6H
3
AsO
4
+ 9H
2
SO
4
+ 28 NO
58. 2NaCrO
2
+ 3Br
2
+ 8 NaOH  2Na
2
CrO
4
+ 6 NaBr + 4 H
2
O
Hóa Hữu Cơ
59. C
6
H
5
OH + 7 O
2

 6 CO
2
+ 3 H
2
O
60. 5C
6
H
12
O
6
+ 24 KMnO
4
+ 36 H
2
SO
4
 12 K
2
SO
4
+24 MnSO
4
+ 30 CO
2
+ 66 H
2
O
61. 3C
2

H
5
OH + K
2
Cr
2
O
7
+ 4 H
2
SO
4
 3 CH
3
CHO + Cr
2
(SO
4
)
3
+ K
2
SO
4
+ 7 H
2
O
62. 5CH
3
CH

2
OH + 4 KMnO
4
+ 6 H
2
SO
4
 5 + 2 K
2
SO

+ 4 MnSO
4
+ 11H
2
O
63. 4C
6
H
5
NO
2
+ 9 Fe + 4 H
2
O  4 C
6
H
5
NH
2

+ 3 Fe
3
SO
4

64. 3CH
3
-CH=CH
2
+ 2 KMnO
4
 3 + 2MnO
2
+ 2 KOH
65. 3 + 8 KMnO
4
+ KOH  3CH
3
-COOK + 8MnO
2
+3 K
2
CO
3
+ 2H
2
O
66. 3

+ 8 KMnO

4
+ 4H
2
O  3CH
3
-COOH + 3CO
2
+ 8 MnO
2
+8 KOH
67. CH
3
-CH
2
-OH + 2I
2
+ 4NaOH  CH
3
I + HCOONa + 3 NaI + 3 H
2
O
68. MnO
2
+ HOOC-COOH + H
2
SO
4
 MnSO
4
+ 2 CO

2
+ 2 H
2
O
69. 2KMnO
4
+ 5HOOC-COOH + 3H
2
SO
4
 K
2
SO
4
+ 2 MnSO
4
+ 10 CO
2
+ 8 H
2
O
70. C
12
H
22
O
11
+ 24 H
2
SO

4
 12 CO
2

↑
+ 24 SO
2

↑
+ 35 H
2
O
4