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Sulphur dioxide acts as a strong reducing agent in alkaline medium.

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SO2 + 2OH-  ⇄ SO42- + 2H+ + 2e bar : reaction proceeds in forward direction as OH- concentration increases 

SO2 + 2H2O ⇄ SO42- + 4H+ + 2e bar : as H+ concentration increases the reaction proceeds in backward direction

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