Answer :

(a) MgSO4 (aq) + Cu (s) CuSO4 (aq) + Mg (s), will not occur. Because copper is less reactive then Mg.

(c) MgSO4 (aq) + Fe (s FeSO4 (aq) + Mg (s), will also not occur. Because Fe is less reactive then Mg. (in both case more reactive metal is being displaced by a less reactive metal, which is not possible).

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