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A student placed an iron nail in a blue copper sulphate solution. After some time, the solution turned light green and a reddish-brown coating appeared on the nail. Which type of reaction does this illustrate?

Answer and explanation

Correct answer: Displacement reaction

Iron is more reactive than copper, so it displaces copper from copper sulphate: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The iron sulphate solution is light green, and the reddish-brown deposit on the nail is copper. Unlike a combination reaction, two substances do not combine to form one product; iron replaces copper.

Related tags

Displacement ReactionMetal ReactivityCopper SulphateIron NailChemical EquationsChemical Reactions

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