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When an iron nail is placed in copper sulphate solution, the solution changes colour and copper is deposited. What type of chemical reaction is this?

Answer and explanation

Correct answer: Displacement reaction

Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). Since a more reactive element replaces a less reactive element from its compound, this is a displacement reaction. In a double displacement reaction, ions from two compounds exchange partners, which does not occur here.

Related tags

Chemical ReactionsDisplacement ReactionMetal ReactivityCopper SulphateIron NailClass 10 Science

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