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Why does the colour of copper sulphate solution change when an iron nail is dipped in it?


Answer :

Iron is more reactive than copper so, when an iron nail dipped in the copper sulphate solution, iron displaces copper from the copper sulphate. Therefore, the colour of the copper sulphate solution changes. Reaction taking place :
\( Fe+ CuSO_4 → FeSO_4 + Cu \)

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