Identify each of the following as an oxidation or a reduction reaction:
a. Na+ (aq) + e− → Na(s)
b. Ni(s) → Ni2+ (aq) + 2e−
c. Cr3+ (aq) + 3 e− → Cr(s)
d. 2H+ (aq) + 2 e− → H2(g)
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