Fe3+ + e- -> Fe2+
2.
Ce3+ -> Ce4+ + e-
:
Ce3+ -> Ce4+ + e-
3.
2Fe2+ -> 2Fe3+ + 2e-
:
2Fe2+ -> 2Fe3+ + 2e-
4.
Sn4+ + 2e- -> Sn2+
:
Sn4+ + 2e- -> Sn2+
Column B
a.Oxidation
b.Reduction
1. b. Reduction
2. a. Oxidation
3. b. Reduction
4. a. Oxidation