A zinc plate was put into a solution of copper sulphate kept in a glass tumbler. It was found that a blue colour of the solution gets fader and fader with the passage of time . After a few days when zinc plate was taken out, a no. of holes were found .

(i) state the reason for the change in the plate

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Solution

Zinc is more reactive than copper and so it had displaced copped from copper sulphate solution thus the colour of the solution got fader and fader with time. Zinc displaced copper and formed zinc sulphate so, when the zinc plate was removed it had holes in it.

copper sulphate + zinc $⟶$ zinc sulphate + copper
$C u S O_{4} + Z n ⟶ Z n S O_{4} + C u$

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