Sulphur dioxide can be used as :

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reducing agent

oxidising agent

bleaching agent

a tribasic acid

answer is A, B, C.

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Detailed Solution

..Sulfur dioxide gas turns moist blue litmus red but bleaches the colour of litmus. Sulfur dioxide gas dissolves in water to form sulphurous acid.
SO₂+H₂O→H₂SO₃
When blue litmus changes its color to red, it indicates acidic solution.
Sulfur dioxide gas acts as a bleaching agent because in presence of water, it is oxidised to sulphuric acid with liberation of nascent hydrogen which reduces colouring matter to colourless.

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