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Question

A moist leaf on exposure to SO2 became rather colourless. But, it regained colour on exposure to atmospheric air. Explain.

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Solution

Bleaching by sulphur dioxide is temporary as atmospheric oxygen re-oxidizes the bleached matter after some time. Sulphur dioxide is a temporary bleaching agent, unlike Chlorine, which is a permanent bleaching agent.
SO2+2H2OH2SO4+2HColouredflower+HColorlessflowerless
Hence, SO2 bleaches by reduction.

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