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  3. Chemistry
  4. Bleaching action of SO2 is due to its:

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Q. Bleaching action of $ SO_{2} $ is due to its:

MGIMS WardhaMGIMS Wardha 2004

Solution:

$SO _{2}$ acts as bleaching agent due to its reducing property.
$SO _{2}+2 H _{2} O \rightarrow H _{2} SO _{4}+2 H$
Coloured matter $+H \rightarrow$ colourless matter