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\( S O_{2} \) is a more powerful reducing agent in:

1. acidic medium
2. alkaline medium
3. neutral medium
4. None of these

Correct answer: acidic medium

Solution

SO2 acts as a reducing agent by getting oxidized to sulfate. In acidic medium, the oxidation of SO2 is more favorable because the relevant redox potentials make SO2 a stronger reducer there than in neutral or alkaline conditions.

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