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Why does the colour of copper sulphate s...

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

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When an iron nail is dipped in copper sulphate solution, iron being more reactive than copper, displaces it from its solution, hence the copper sulphate solution loses its colour.
`underset("blue")(CuSO_(4))(aq.)+underset("Grey")(Fe(s))to underset("green")(FeSO_(4))(aq.)+Cu(s)`.
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Knowledge Check

  • When excess of KI is added to copper sulphate solution

    A
    No reaction takes place
    B
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    C
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