Why is cl2 permanent bleaching agent whereas so2 is temporary?
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Answer:This is because the mechanism for bleaching is different: SO2-Reduction => TEMPORARY. Cl2-Oxidation => PERMANENT.
Explanation:It is because Sulphur dioxide removes oxygen from the coloured substance and makes it colourless. But atmospheric oxygen slowly takes place of the removed oxygen and because of which the material regains the colour.
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