For each of the following reactions, identify the substance that is oxidized, the substance that is reduced, the oxidizing agent, and the reducing agent:
a. 2HgO(s) → 2Hg(l) + O2(g)
b. Zn(s) + 2HCl(aq)→ ZnCl2(aq) + H2(g)
c. 2Na(s) + 2H2O(l) → 2Na+ (aq) + 2OH− (aq) + H2 (g)
d. 14H+ (aq) + 6Fe2+ (aq) + Cr2O72− (aq) → 6Fe3+ (aq) + 2Cr3+ (aq) + 7H2O (l)
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