Identify each of the following as an oxidation or a reduction reaction:
a. O2(g) + 4 e− → 2O2− (aq)
b. Al(s) → Al3+ (aq) + 3 e−
c. Fe3+ (aq) + e− → Fe2+ + (aq)
d. 2Br−(aq) → Br2(l) + 2 e−
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