Eduprobe
Question:
Name the gas that can readily decolourise acidified KMnO4 solution.
CO2
SO2
NO2
P2O5
Solution:
SO2 gas can readily decolourise acidified KMnO4 solution. Acidified KMnO4 oxidises SO2 to H2SO4. KMnO4 itself is reduced to MnO2.