Sulphur dioxide can be used as:

bleaching agent

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antichlor

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disinfectant

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none of these

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Solution

The correct options are
A bleaching agent
B disinfectant
C antichlor
Although its chief uses are in the preparation of sulfuric acid, sulfurtrioxide, and sulfites, sulfur dioxide also is used as a disinfectant, a refrigerant, a reducing agent, a bleach, and a food preservative, especially in dried fruits.

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The temporary bleaching action by sulphur dioxide can be reversed by reacting the material with :

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