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An iron nail was kept in a blue copper sulfate solution for some time. The solution turned light green and a reddish-brown coating appeared on the nail. Which is the correct explanation of this change?

Answer and explanation

Correct answer: Iron displaces copper from copper sulfate solution.

Iron is more reactive than copper, so it displaces copper from copper sulfate solution: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The iron sulfate formed makes the solution light green, and displaced copper deposits as a reddish-brown coating on the nail. Unlike option B, less reactive copper cannot displace iron from its salt solution.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulfateIron NailRedox Reaction

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