What changes in the colour of iron nail and copper sulphate solution do you observe after keeping the iron nail is dipped in copper sulphate solution for about 30 minutes?
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When iron nail ferrum is dipped in copper sulphate CuSO4 there takes reaction between them and coppersulphate change its color from blue to light green. This shows iron is more reactive than copper it can replace copper from CuSO4
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The ferrous sulphate crystals are light green in colour. The gas emitted has the characteristic odour of burning sulphur. On heating, the colour changes from light green to white. On further heating, the white substance changes to
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