Bleaching action of SO2 is not permanent why?
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Bleaching by sulphur dioxide is temporary as atmospheric oxygen re-oxidizes the bleached matter after some time. ... The bleaching action sulphur dioxide is due to its reducingaction. The colour of pigment on exposure to SO2 gets reduced to a colourless compound.
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When chlorine reacts with water, it produces nascent oxygen. ... It removes oxygen from the dye. However, the atmospheric oxygen slowly reoxides the bleached material, because of which the bleached material changes to its original colour. This is why bleaching by sulphur dioxide is not permanent.Oct
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