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When an iron nail is placed in a blue copper sulphate solution, what is the main reason the solution turns green?

Answer and explanation

Correct answer: Formation of iron(II) sulphate

Iron is more reactive than copper. Therefore, it displaces copper from copper sulphate solution and forms pale-green iron(II) sulphate:
\[\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\]
Thus, the solution turns green, while copper is deposited as a reddish-brown coating on the nail. Copper oxide is not formed in this displacement reaction.

Related tags

ScienceClass-10Chemical-ReactionsDisplacement-ReactionCopper-SulphateReactivity-Series

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