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D and F Block Elements question

2017 · Q97
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D and F Block Elements question

2017 · Q97

NEETChemistryD and F Block ElementsMCQ+4 / −1
Name the gas that can readily decolourise acidified KMnO4 solution.
  1. A
    SO2
  2. B
    NO2
  3. C
    P2O5
  4. D
    CO2
View written solutionFree

Correct answer: A

Acidified KMnO4 is a strong oxidizing agent thus, among the given option which readily undergoes oxidation with KMnO4 will decolourise it. CO2, NO2 and P2O5 are already in their highest oxidation state while SO2 can further oxidize with KMnO4 to give sulphate ions.

2MnO4– + 5SO2 + 2H2O →\to→ 2Mn2+ + 5SO42– + 4H+

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