Question

Assertion :$KMn{O}_4$ is a stronger oxidising agent than $K_2{Cr}_2{O}_7$. Reason: This is due to the increasing stability of the lower species to which they are reduced.

• 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. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

In $KMn{O}_4$, the oxidation state of $Mn$ is $+7$. (highest oxidation state) and is reduced to ${Mn}^{2+}$, whereas in $K_2{Cr}_2{O}_7$, the oxidation state of $Cr$ is $+6$ (highest oxidation state) and is reduced to ${Cr}^{3+}$.

${Mn}^{2+}$ is more stable than ${Cr}^{3+}$. Hence, $KMn{O}_4$ is a stronger oxidising agent than $K_2{Cr}_2{O}_7$.