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What coloured coating forms on an iron nail when it is placed in copper sulphate solution?

Answer and explanation

Correct answer: Reddish-brown

Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The displaced copper deposits on the iron nail as a reddish-brown coating. Blue is the colour of the copper sulphate solution, not of the coating on the nail. Reaction: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\).

Related tags

ScienceClass10Chemical-ReactionsDisplacement-ReactionCopper-SulphateReactivity-Series

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