Question

Bleaching action of $S{O}_2$ is due to its:

• A. oxidising property
• B. acidic property
• C. basic property
• D. reducing property

Answer 1

Answer: (D)

$S{O}_2$ acts as bleaching agent due to its reducing property.
$S{O}_2+2H_{2}O\to H_{2}S{O}_4+2H$
Coloured matter $+H\to$ colourless matter