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Question

Name the gas that can readily decolourise acidified KMnO4 solution:

A
CO2
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B
SO2
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C
NO2
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D
P2O5
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Solution

The correct option is B SO2
SO2 readily decolourises acidified KMnO4 as follows,

5SO2+2KMnO4+2H2O2H2SO3+2MnSO4+K2SO4

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