Question

Assertion
$KMn{O}_4$ acts as an oxidising agent is acidic, basic medium.

Reason
$KMn{O}_4$ oxidises ferrous sulphate to ferric sulphate.

• 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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

$KMn{O}_4$ acts as oxidising agent in acidic medium as its oxidation state change from +7 to +2 while in basic medium its oxidation state changes from +7 to +4.
$KMn{O}_4$ oxidises Ferrous sulphate $(Fe=+2)$ to Ferric sulphate $(Fe=+3)$
$5F{e}^{2+}+Mn{O}_4^{–}+8H^{+}\to M{n}^{2+}+4H_{2}O+5F{e}^{3+}$
Hence, both assertion and reason are correct but reason is not correct explanation of assertion.