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When a clean iron nail is placed in a blue \(CuSO_4\) solution, a reddish-brown coating forms on the nail. Which conclusion correctly explains this change?

Answer and explanation

Correct answer: Iron is oxidised and \(Cu^{2+}\) is reduced

Iron is more reactive than copper, so it displaces copper from copper sulfate solution: \(Fe + CuSO_4 \rightarrow FeSO_4 + Cu\). Here, \(Fe^0 \rightarrow Fe^{2+} + 2e^-\) is oxidation, while \(Cu^{2+} + 2e^- \rightarrow Cu\) is reduction. The reddish-brown coating is copper metal. Unlike option B, iron loses electrons rather than gaining them.

Related tags

Chemical ReactionsDisplacement ReactionRedox ReactionReactivity SeriesCopper SulfateIron Nail

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