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When an iron nail is placed in a blue copper sulphate solution, the solution turns green and a reddish-brown coating forms on the nail. What type of reaction is this?

Answer and explanation

Correct answer: Displacement reaction

Iron is more reactive than copper. Therefore, iron displaces copper from copper sulphate and forms iron sulphate. The green solution is iron sulphate, \(\mathrm{FeSO_4}\), and the reddish-brown coating is copper metal. The reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). It is a displacement reaction because a more reactive metal replaces a less reactive metal from its compound. In a double displacement reaction, ions of two compounds exchange partners, which does not occur here.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulphateIron NailClass 10 Science

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