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A solution of CuSO4 was kept in an iron ...

 A solution of CuSO4 was kept in an iron pot. After few days the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved. 

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As iron is more reactive metal than copper. it displaces copper from copper sulphate solution. The following reaction takes place
`underset("Iron")(Fe(s))+underset"Copper(II)sulphate"(CuSO_(4)(aq))tounderset("Iron (II)sulphate")(FeSO_(4)(aq))+underset"Copper"(Cu(s))`
Since, iron takes part in this reaction. therefore holes are produced at places where iron metal has reacted to form iron (II) sulphate.
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