Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it?

Copper sulphate solution changes its colour because iron nail dipped in the solution is more reactive than copper sulphate and it displaces the molecules. It is a displacement reaction. The copper gets deposited over the nail as the copper sulphate solution becomes iron sulfate solution and colour changes from blue to green.

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Updated on: 10-Oct-2022

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