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When an iron nail is placed in copper sulphate solution, the pale green solution formed mainly contains which substance?

Answer and explanation

Correct answer: Iron sulphate

Iron is more reactive than copper. It therefore displaces copper from copper sulphate and forms iron sulphate: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The \(\mathrm{FeSO_4}\) solution is pale green, while copper is deposited on the nail as a reddish-brown solid. Copper oxide would require reaction with oxygen and is not formed in this displacement reaction.

Related tags

Class 10 ScienceChemical ReactionsDisplacement ReactionIron SulphateCopper SulphateReactivity Series

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