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The colour of copper sulphate solution c...

The colour of copper sulphate solution changes when an iron nail is dipped in it. State the reason giving chemical equation for the reaction involved.

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`CuSO_4+Fe to FeSO_4+Cu`
(Blue) (Green)
Iron is more reactive than copper. Hence it displaces copper from copper sulphate and due to formation of `FeSO_4`, the colour changes from blue to green.
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