Question

Assertion: Both chlorine and sulphur dioxide act as bleaching agents.
Reason: Chlorine bleaches by vigorous oxidation, while sulphur dioxide bleaches by mild reduction.

• A. It both Assertion and Reason are true and the Reason is a correct explanation of the Assertion
• B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion
• C. If Assertion is true but the Reason is false
• D. If both Assertion and Reason is false

Answer 1

Answer: (A)

$S{O}_2$ in presence of moisture acts as a bleaching agent. This is due to the reducing nature of $S{O}_2$. But bleaching action is only temporary.

$S{O}_2+2H_{2}O\to H_{2}S{O}_4+2[H]$

Similarily, $C{l}_2$ in presence of moisture give out nascent, oxygen and cause bleaching.

$C{l}_2+H_{2}O\to 2HCl+[O]$

here bleaching action is permanent.