Which of the following can undergo a chemical reaction? (a) MgSO4 + Fe (b) ZnSO4 + Fe (c) MgSO4 + Pb (d) CuSO4 + Fe

Soln:

Answer is (d) CuSO₄ + Fe

Explanation:

Iron is more reactive than copper hence it displaces copper in the reaction to form Feso_4.