Determine whether each reaction is an oxidation–reduction reaction. For each oxidation–reduction reaction, identify the oxidizing agent and the reducing agent.

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(a) 2 Mg(s) + O₂(8) 2 MgO(s) (b) 2 HBr(aq) + Ca(OH)₂(aq) → 2 H₂O(I) + CaBr₂(aq) 2+ (c) Zn(s)+Fe²+ (aq) Zn²+ (aq) + Fe(s)