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Dry SO(2) does not bleach dry flowers be...

Dry `SO_(2)` does not bleach dry flowers because

Text Solution

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Sulphur dioxide acts as a bleaching agent only is moist conditions. Nascent hydrogen responsible for reduction is produced  
`SO_(2)+2H_(2)Orarr 2(H)+H_(2)SO_(4)`
Coloured flower `+ (H) rarr` Colourless flower
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