On keeping iron nails in blue colour copper sulphate solution it is observed that the colour of the solution turns green after sometimes give reason for this colour change in the type of reaction

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Solution

Colour changes due to the displacement reaction. Iron being more reactive than copper displaces copper from its salt solution to form iron sulphate. Iron sulphate is green in colour. The reaction that takes place CuSO4 + Fe --> FeSO4 + Cu

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