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A student places a clean iron nail in a blue copper sulphate solution. After some time, the solution turns green and a reddish-brown coating appears on the nail. What is the correct conclusion from this experiment?

Answer and explanation

Correct answer: Iron displaces copper from its salt solution, forming iron sulphate.

Iron is more reactive than copper. Therefore, it displaces copper from copper sulphate solution. This is a displacement reaction:

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

The iron sulphate formed makes the solution green, while displaced copper deposits as a reddish-brown coating on the nail. Option B is incorrect because copper is less reactive than iron and cannot displace iron.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulphateIron NailClass 10 Science

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