Practice Sheet: Balancing Redox Reactions

Practice Sheet: Balancing Redox Reactions
1. Indicate the oxidation number of the bold-italicized element in the following compounds:
a. CO
b. CO 2
c. IF 7
d. Li 3 N
e. K 2 S
f. SnCl 4
g. BaSO 4
h. OF 2
i. Ca(NO 3 ) 2
j. Fe 2 O 3
k. HClO
l. HClO 3
2. Indicate the oxidation number of the italicized element in the following ions:
a. PO 4
3-
b. BO 3
3-
c. ZrI 3
-
d. IO 3
-
e. AsO 3
3-
f. HCO 3
-
g. NH 4
+
h. NO 3
-
i. SO 4
2-
j. P 3 O 10
5-
k. S 2 O 3
2-
3. Indicate the oxidation number of the italicized element in the following compounds:
a. PCl 3
b. PCl 5
c. POCl 2
d. SO 2
e. SO 3
f. SCl 2
g. CrCl 3
h. K 2 CrO 4
i. Cr 2 O 3
j. MnO 2
k. KMnO 4
l. Mn 2 O 7

Balance the following equations that are in acidic solution:
1. H 2 S (g) + NO 3
-
(aq) NO (g) + S (s)
2. MnO 4
-
(aq) + Cl - (aq) Cl 2(g) + Mn 2+ (aq)
3. Cl - (aq) + Cr 2 O 7
2-
(aq) Cr 3+ (aq) Cl 2(g)
4. HgS (s) + NO 3
-
(aq) + Cl - (aq) HgCl 4
2-
(aq) + NO (g) + S (s)
5. Fe 2+ (aq) + MnO 4
-
(aq) Fe 3+ (aq) + Mn 2+ (aq)
6. BiO 3
-
(aq) + Mn 2+ (aq) MnO 4
-
(aq) + Bi 3+ (aq)
7. WO 3(s) + Sn 2+ (aq) + Cl - (aq) W 3 O 8(s) + SnCl 6
2-
(aq)
8. NiO 2(s) + Ag (s) Ni 2+ (aq) + Ag + (aq)
9. Fe 3+ (aq) + H 2 S (g) Fe 2+ (aq) + S (s)
10. PbO 2(s) + Mn 2+ (aq) Pb 2+ (aq) + MnO 4
-
(aq)
11. TcO 4
-
(aq) + Ti (s) Tc 2+ (aq) + Ti 3+ (aq)
12. IO 3(aq) + I - (aq) I 2(s)
13. C 2 H 4(g) + MnO 4
-
(aq) Mn 2+ (aq) + CO 2(g)
Balance the following equations that are in basic solution:
1. Cr 3+ (aq) + MnO 2(s) Mn 2+ (aq) + CrO 4
2-
(aq)
2. Bi(OH) 3(s) + SnO 2
2-
(aq) Bi (s) + SnO 3
2-
(aq)
3. MnO 4
2-
(aq) MnO 4
-
(aq) + MnO 2(s)
4. Mn 2
+
(aq) + Br 2(l) MnO 2(s) + Br - (aq)
5. Cr 3+ (aq) + H 2 O 2(aq) CrO 4
2-
(aq)
6. Ag 2(s) + HPO 3
2-
(aq) Ag 2(s) + PO 4
3-
(aq)
7. NO 2
-
(aq) + MnO 4
-
(aq) NO 3
-
(aq) MnO 2(s)