Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?

(a) MgSO₄ + Fe

(b) ZnSO₄ + Fe

(c) MgSO₄ + Pb

(d) CuSO₄ + Fe

Solution:

Option (d) is the answer. Iron displaces copper from its sulphate solution to produce iron sulphate and copper.