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Oxides of Sulphur

Which of the ...

Question

Which of the following molecule acts as a bleaching agent?

A

S O_{2}

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B

C O_{2}

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C

N O_{2}

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D

S O_{3}

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Solution

The correct option is B $S O_{2}$
In the presence of moisture, sulphur 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 takes place.
Colourless matter $+ [O] \to$ Coloured matter.

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