When an article is bleached by $S O_{2}$ it loses its colour. The colour can be restored by :

Exposure to air.

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Heating.

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Dilution.

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None of these.

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Solution

The correct option is A Exposure to air.
Colour can be restored by air as bleaching done by $S O_{2}$ is due to reduction.
Oxygen in the atmosphere reoxidizes reduced dyes.

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