Question

4. A zinc plate was kept in a glass container having copper sulphate solution. On examining it was
found that the blue colour of the solution is getting fader and fader. After a few days when the zine
plate was taken out of the solution, a number of small holes were noticed in it. State the reason and
give chemical equation of the reaction involved.
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Answer 1

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State the reason and give the chemical equation of the reaction involved.

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Zinc is more reactive than copper. Hence, when a zinc plate is kept in a solution of copper sulphate, it slowly displaces copper from the solution and blue colour of the solution keeps fading away. Because of zinc going into solution as zinc sulphate a number of holes are seen in the zinc plate.

Reaction :

CuSO4(aq) + Zn(s) -------------) ZnSO4(aq) + Cu(s)

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