The bleaching action of chlorine is permanent, whereas that of SO_2 is temporary, because

JEE Main Chemistry question

The bleaching action of chlorine is permanent, whereas that of is temporary, because

(A)Chlorine bleaches by oxidation, permanently destroying the coloured compound, whereas bleaches by reduction, forming a colourless adduct that can revert to the original colour on exposure to air/oxidationCorrect
(B)Chlorine reacts faster than with coloured matter
(C) is a weaker acid than
(D)Chlorine requires sunlight to bleach, while does not

Answer: (A)

Solution

Chlorine bleaches via the nascent oxygen released by hydrolysis (Cl_2+H_2O\rightarrow HCl+HOCl\rightarrow HCl+[O]), which oxidatively destroys the coloured organic matter — an irreversible, permanent change. , by contrast, bleaches by

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Question ID VK-146067