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In the given reaction: 3K₂MnO₄ + 2H₂O + 4CO₂ → 2KMnO₄ + MnO₂ + 4KHCO₃, what role does CO₂ play?

1. To acidify the solution by producing KHCO₃
2. To make the solution alkaline by generating CO₃²⁻
3. To serve solely as a reaction medium
4. None of these

Correct answer: To acidify the solution by producing KHCO₃

Solution

CO₂ plays a role in acidifying the solution by reacting with potassium ions to produce KHCO₃, which in turn affects the pH of the solution and influences the reaction.

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