What happens when an iron nail is dipped into a copper sulphate solution?

Solution

This is a multiple-correct question, and all four options (a), (b), (c) and (d) are correct. Iron is more reactive than copper and displaces it, $$\text{Fe} + \text{CuSO}_4 \rightarrow \text{FeSO}_4 + \text{Cu}$$. Iron atoms go into solution as $$\text{Fe}^{2+}$$, so the nail dissolves and the blue solution turns pale green, while copper is deposited on the nail as a reddish-brown coating.

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