Which reaction below is a redox reaction? a) 2HClO4(aq) + Ba(OH)2(aq) → Ba(ClO4)2(aq) + H2O(l) b) Ag+(aq) + Cl–(aq) → AgCl(s) c) Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq) d) Mg(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2(g) e) All of these are redox reactions. not sure how to assign oxidation numbers to compounds with parenthesis, like Mg(NO3)2

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