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When an iron nail is dipped in a copper sulfate solution, which observation confirms a displacement reaction?

Answer and explanation

Correct answer: The blue solution gradually turns green and copper deposits on the nail

Iron is more reactive than copper, so it displaces copper from copper sulfate solution: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The blue solution turns green due to iron sulfate, and displaced copper deposits on the nail. Hydrogen gas evolution is typically associated with a metal reacting with an acid, not with this reaction.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulfateIron NailClass 10 Science

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