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An iron nail is placed in a blue copper sulphate solution for some time. Which observation is correct?

Answer and explanation

Correct answer: The solution turns light green and copper is deposited on the nail.

Iron is more reactive than copper, so it displaces copper from copper sulphate solution: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The ferrous sulphate formed makes the blue solution light green, and displaced copper deposits on the nail. Option B is incorrect because a displacement reaction occurs between iron and copper sulphate.

Related tags

Chemical ReactionsDisplacement ReactionMetal Reactivity SeriesCopper SulphateIron NailReaction Observation

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