what happened when 3mark answer falling question
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when iron nail is dipped in copper sulphate solution, iron being more reactive displaces copper from its solution and forms iron sulphate.
Iron (Fe) + copper sulphate (CuSO4) —> iron sulphate (FeSO4) + copper (Cu)
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Iron nails is dipped in CuSO4 solution because iron is more reactive then copper and it's colour change from blue to light green
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