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Why dry SO2 cannot bleach dry flowers ?...

Why dry `SO_2` cannot bleach dry flowers ?

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`SO_(2)` acts as a bleaching agen only in the presence of moisture, as the nascent hydrogen which is responsible for bleaching is produced.
`SO_(2) + H_(2) O rarr H_(2) SO_(4) + 2[H]`
Coloured flower `+ [H] rarr` colourless flower.
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