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

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Name the gas that can readily decolourise acidified `KMnO_(4)` solution:
A. `SO_(2)`
B. `NO_(2)`
C. `P_(2) O_(5)`
D. `CO_(2)`
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Correct Answer - A
`SO_(2)` is readily decolourises acidified `KMnO_(4)`
`2Kunderset((O.A))overset(+7)(MnO_(4)) + 5underset((R.A))overset(+4)(SO_(2)) + 2H_(2)O rarr underset("Colourless")(2MnSO_(4)) + 2H_(2)SO_(4) + K_(2)SO_(4)`
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