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. 2NiS (s) + 3O2(g) → 2NiO(s) + 2SO2(g)
b. Sn2+ (aq) + 2Fe3+ (aq) → Sn4+ (aq) + 2Fe2+ (aq)
c. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
d. 2Cr2O3(s) + 3Si(s) → 4Cr(s) + 3SiO2(s)
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