Question

Assertion :$E^{\circ }$ for $M{n}^{3+}/M{n}^{2+}$ is more positive than $C{r}^3/C{r}^{2+}$. Reason: The third ionization energy of $Mn$ is larger than that of $Cr$.

• 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Reduction potential: $M{n}^{3+}>C{r}^{3+}$.

So, $M{n}^{3+}$ is easily reduced in comparison with $C{r}^{3+}$ or $C{r}^{2+}$ is easily oxidised than $M{n}^{2+}$.

Hence $M{n}^{2+}$ will lose electrons with difficulty or ionisation potential will be $M{n}^{2+}>C{r}^{2+}$.

Both A and R are true.