# Name the gas that can readily decolourise acidified KMnO4 solution.

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Name the gas that can readily decolourise acidified $\require{mhchem}\ce{KMnO4}$ solution.

(a) $\ce{SO2}$

(b) $\ce{NO2}$

(c) $\ce{P2O5}$

(d) $\ce{CO2}$