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

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

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Iron nail acquires a brown coating of copper as a result of displacement reaction. The solution becomes light green.

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

Iron nail                   Deposited on nail

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