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When an iron nail is placed in copper sulphate solution, which substance is deposited on the surface of the nail?

Answer and explanation

Correct answer: Copper

Iron is more reactive than copper, so it displaces copper from copper sulphate solution:
\[\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\]
The displaced copper forms a reddish-brown coating on the iron nail. Iron sulphate is formed in the solution; it does not deposit on the nail.

Related tags

ScienceClass 10Chemical ReactionsDisplacement ReactionReactivity SeriesCopper Sulphate

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