why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?
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When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
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answer for ur question.iron is more reactive than copper so the copper sulphate solution change its colour blue to pale green
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