Question

Assertion :In the reaction between potassium permanganate and potassium iodide, permanganate ions act as oxidizing agent. Reason: Oxidation state of manganese changes from $+2$ to $+7$ during the reaction.

• 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

$2KMn{O}_4+2KI⟶2Mn{O}_2+I_2+4KO$

Oxidation state of $Mn$ in $2KMn{O}_4$is $-2+2x-16=0$

$x=9$

Oxidation state of $Mn$ in $2Mn{O}_2$ is $2x-8=0$

$x=4$

The decrease of oxidation state indicates that $Mn$ is oxidising agent