Question

Assertion (A) A negative value of $E^{\circ }$ means that the redox couple is a weaker reducing agent than the $H^{+}/H_2$ couple.
Reason (R) A negative $E^{\circ }$ means that the redox couple is stronger reducing agent than the $H^{+}/H_2$.

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $A$ is incorrect; $R$ is correct.

Answer 1

Answer: (D)

As we know $H^{+}/H_2$ couple has zero standard reduction potential so, ions having positive $E^{\circ }$ value are weaker reducing agent, while ions having negative $E^{\circ }$ value are stronger reducing agent.
Thus, $A$ is incorrect and $R$ is correct.