For the reactions below, identify those that are oxidation-reduction reactions. For each oxidation-reduction reaction, identify all species and their role in the reaction (oxidized, oxidizing agent, etc.). a.   2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g) b.   Na2S (aq) + 2 HCl (aq) → 2 NaCl (aq) + H2S (aq) c.   2NH3 (aq) + OCl- (aq) ← → N2H4 (aq) + H2O (l) + Cl-(aq)

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