A gas which turns KMnO4 paper from purple to colourless
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Sulphur dioxide turns acidified potassium permanganate from purple to colourless.
Potassium permanganate, KMnO4, when used in titration, the initial oxidation of Mn is +7 and the color is deep purple. When the reaction is going on, it acts as a oxidizing agent and Mn gets reduced to the oxidation state of +2 . Thus turning the solution to colourless
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