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Dry sulphurdioxide does not bleach dry f...

Dry sulphurdioxide does not bleach dry flowers. Explain. 

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_92)O to 2(H) + H_(2) SO_(4)`
Coloured flower + (H) `to` Colourless flower
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