Take a rod of metallic zinc, clean it well with a sand paper and then place it in a solution of copper nitrate in a beaker. Which of the following changes are observed?

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Reddish brown copper metal starts depositing on the zinc rod.

Both (a) and (b)

Heat is consumed in the reaction

Zinc rod gradually starts dissolving

answer is D.

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Detailed Solution

When rod of metallic zinc is dipped in the solution of copper nitrate, the intensity of blue colour of solution decreases because of the dissolution of zinc rod and finally reddish brown copper metal starts depositing on the zinc rod.

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