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The bleaching action of SO_(2) is temporary but that of Cl_(2) is permanent-why? |
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Answer» Solution :In the presence of water, `SO_(2)` bleaches by reduction. `SO_(2)+2H_(2)OtoH_(2)SO_(4)+2[H]`(NASCENT) Coloured ORGANIC matter `underset("Reduction")overset([H])to`Bleached organic matter It is not permanent bleaching because the bleached matter regains its original colour if it is kept in air. On the other hand, in the presence of water, `Cl_(2)` bleaches by oxidation. `Cl_(2)+H_(2)Oto2HCl+[O]`(nascent) Coloured organic matter `underset("Oxidation")overset([O])to`Bleached organic matter It is permanent bleaching because if the bleached substance is exposed to air, there is no possibility of its reduction. Thus, its original colour cannot be restored. |
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