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Name the gas that can readily decolouris...

Name the gas that can readily decolourise acidified `KMnO_(4)` solution:

A

`P_(2)O_(5)`

B

`CO_(2)`

C

`SO_(2)`

D

`NO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`SO_(2)` is a gas that can readily decolourise acidified `KMnO_(4)` solution.
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An aqueous solution of gas ‘A’ gave the following data (reactions): It decolourised an acidified KMnO_(4) solution.

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Why can’t HCl acid be used to acidify KMnO_(4) solution ?