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When iron nails are kept copper sulphate solution for some time.
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Explanation. When iron nails are kept in copper sulphate solution for some time. As Fe is more reactive than Cu (according to reactivity series) so, it displaces Cu from CuSO4 and react with Fe to give FeSO4 and Cu. (Iron formed is brown in colour and colour of copper sulphate solution changes from blue to light green.
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