Question

Assertion :When $ZnS{O}_4$ solution is acidified, $Zn$ is deposited at the cathode and $H_2$ (g) is not evolved. Reason: The eletrode potential of $Zn$ is more negative than hydrogen.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is D Assertion is incorrect but Reason is correct

Assertion

When $ZnS{O}_4$ solution is acidified, $Zn$ is not deposited at the cathode instead $H_2$ (g) is evolved.

Reason

The electrode potential of $Zn$ is more negative than hydrogen. So, H ion is reduced to form hydrogen gas.

Protons has a much greater tendency to get reduced than zinc ions.

The assertion is incorrect but the reason is correct.

Hence, option $\left(D\right)$ is correct answer.