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Why does the colour of copper suphate so...

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

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Iron metal is more reactive than copper. It thus displaces copper from copper sulphate solution forming ferrous sulphate. Therefore the colour of the solution changes to pale green. Reddish brown copper metal deposits on iron nail.
`Fe(s)+CuSO_(4)(aq) to Fe(SO_(4))(aq)+Cu(s)`
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