JEE Advanced Chemistry question

When an article is bleached by SO2 it loses its colour. The colour can be restored by

(A)Exposure to airCorrect
(B)Heating
(C)Dilution
(D)None of these

Answer: (A)

Solution

SO2 bleaches coloured organic materials by *reducing* the coloured compound to a colourless form — a reversible, non-permanent (non-oxidative) bleaching action, unlike the permanent oxidative bleaching of Cl2. Because the bleaching is due

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Question ID VK-159361