1.

Bleaching action of chlorine is permanent. Justify this statement.

Answer»

Solution :Chlorine is a strong oxidising and bleaching agent because of the NASCENT oxygen.
`H_(2)O+Cl_(2)RARR underset("Hypo chlorous acid")(HCl+HOCl)`
`HOClrarr HCl+(O)`
`"Colouring matter"+"Nascent oxygen"rarr"Colourless OXIDATION product"`
Therefore, bleaching of chlorine is permanent. It oxidises ferrous salts to ferric, SULPHITES to sulphates and hydrogen sulphide to sulphur.
(i) `underset("(Ferrous)")(2FeSO_(4))+H_(2)SO_(4)+HOClrarr underset("(Ferric)")(Fe_(2)(SO_(4))_(3))+HCl+H_(2)O`
(ii) `underset("(Sulphite)")(Na_(2)SO_(3))+HOClrarr underset("(Sulphate)")(Na_(2)SO_(4))+HCl`
(iii) `underset("(Sulphide)")(H_(2)S)+Cl_(2)rarr underset("(Sulphur)")(2HCl)+S`


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