Question

what happens when iron nail is placed in copper sulphate solution

Answer 1

When iron nail is dipped in copper sulphate solution, iron displaces copper from its solution and forms iron sulphate.

Fe+CuSo4=FeSo4+Cu

(blue) (green)

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Answer 2

Iron being more reactive displaces copper from copper sulphate solution. In this reaction, the blue colour of copper sulphate fades and there is deposition of copper on the iron nail.