when iron nail is dipped in copper sulphate solution and kept undisturbed for half an hour
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When Iron nail (Fe) is dipped in Copper sulphate (CuSO4) there takes reaction between them and copper sulphate change its color from blue to light green. This shows Iron is more reactive than Copper, it can replace Copper from CuSO4. ... So, the solution changes it color from Blue to Light Green.
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Explanation:
Iron displaces copper from its salt solution and forms Ferrous sulphate solution which is green in colour.
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