A) \[S{{O}_{2}}\]
B) \[C{{O}_{2}}\]
C) \[N{{O}_{2}}\]
D) \[S{{O}_{3}}\]
Correct Answer: A
Solution :
In the presence of moisture, sulphure dioxide acts as a bleaching agent. \[S{{O}_{2}}+2{{H}_{2}}O\to {{H}_{2}}S{{O}_{4}}+2[H]\] The nascent hydrogen bleaches vegetable colouring matter to colourless matter. Colouring matter \[+[H]\to \]Colourless matter. On exposing the bleached article to air, the reverse process take place. Colourless matter \[+[O]\to \]Coloured matter.
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