A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour
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The blue solution eill turn hreen and there will be a reddish-brown deposit on the iron nail. This is the displacement of the copper ion from its compound by the iron ion.
CuSO4 + Fe -> FeSO4 + Cu
CuSO4 + Fe -> FeSO4 + Cu
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