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Why does the colour of copper sulphate ...

Why does the colour of copper sulphate solution change when an iron nail is dipped in it ? Write chemical equation for the reaction involved.

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Iron is more reactive than copper. Iron displaces copper from copper sulphate solution and forms iron sulphate, hence the colour of solution changes.
Equation: `Fe+CuSO_(4)(aq)rarrFeSO_(4)(aq)+Cu`
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