Question

Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Write the balanced chemical equation for this reaction. Name the type of this chemical reaction.

Answer 1

When an iron nail is dipped in copper sulphate solution, it becomes brownish in colour because iron has replaced copper from its solution.
Thus the amount of copper sulphate decreases and its colour fades.
Fe_(s) + CuSO_4(aq) → FeSO_4(aq) + Cu_(s)
This is a displacement reaction.