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Name the gas that can readily decolouris...

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

A

`CO_2`

B

`SO_2`

C

`NO_2`

D

`P_2O_5`

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The correct Answer is:
B
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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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