Question

# Assertion :Both $$SO_2$$ and $$SO_3$$ are reducing agents. Reason: Both $$SO_2$$ and $$SO_3$$ bleach the articles by oxidation.

A
Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion
B
Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion
C
The Assertion is correct but the Reason is incorrect
D
The Assertion is incorrect but the Reason is correct

Solution

## The correct option is C The Assertion is correct but the Reason is incorrectSulphur dioxide and trioxide ($$SO_2$$ and $$SO_3$$) bleaches by reduction and they themselves gets oxidized to $$H_2SO_4$$. Presence of moisture is essential for bleaching.$$SO_2 (g) + 2H_2O \rightarrow H_2SO_4 (aq.) + 2[H]$$$$2[H] +$$ colouring matter $$\rightarrow$$Colourless matter.2. Bleaching by $$SO_2$$ and $$SO_3$$ is temporary as atmospheric oxygen re-oxidizes the bleached matter after some time.therefore assertion is correct as they get reduce water and gets oxidize and thereafter bleaches the article by reduction. so reason is wrongOption C is correctChemistry

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