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Why does a reddish-brown coating form on an iron nail placed in copper sulphate solution?

Answer and explanation

Correct answer: Iron displaces copper from copper sulphate, and copper deposits on the nail.

Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The displaced copper deposits on the iron nail as a reddish-brown coating. The reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). Iron oxide in option C is associated with rusting, whereas the coating in this reaction is copper.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesIronCopper SulphateClass 10

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