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A clean iron nail is immersed in a blue copper sulphate solution for some time. Which observation is correct?

Answer and explanation

Correct answer: The blue solution will turn pale green and reddish-brown copper will deposit on the nail.

Iron is more reactive than copper, so it displaces copper from copper sulphate: \\(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\\). The iron sulphate formed makes the solution pale green, and displaced copper appears as a reddish-brown deposit on the nail. Unlike option B, the solution does not become colourless after the reaction.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulphateIron NailClass 10 Science

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