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When an iron nail is kept in a blue copper sulphate solution for some time, the solution turns light green and a reddish-brown coating forms on the nail. Which is the correct explanation for this observation?

Answer and explanation

Correct answer: Iron is more reactive than copper, so it displaces copper from copper sulphate.

Iron is above copper in the reactivity series. Therefore, iron displaces copper from copper sulphate solution:


\(
\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}
\)

The iron sulphate formed gives the solution a light-green colour, while displaced copper deposits as a reddish-brown coating on the nail. Option D is incorrect because dilution alone cannot produce a solid copper deposit.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulphateIron NailClass 10 Science

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