COMEDK · Chemistry · 9. Redox Reactions
Which of the following gas readily de-colourises the acidified \(\mathrm{KMnO}_4\) solution?
- A \(\mathrm{CO}_2\)
- B \(\mathrm{SO}_2\)
- C \(\mathrm{P}_2 \mathrm{O}_5\)
- D \(\mathrm{NO}_2\)
Answer & Solution
Correct Answer
(B) \(\mathrm{SO}_2\)
Step-by-step Solution
Detailed explanation
Sulphur dioxide gas readily decolourises the purple colour of acidifide \(\mathrm{KMnO}_4\) solution. In this case, \(\mathrm{KMnO}_4\) acts as an oxidising agent and sulphur dioxide gas acts as a reducing agent.
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