1.

Bleaching powder in cold water is an excellent bleaching agent. But it cannot act as a good bleaching agent when dissolved in hot water.Why?

Answer»

Solution :BLEACHING powder reacts with cold water to produce chloride and hypochlorite ions. Hypochlorite ions dissociate producing NASCENT oxygen Which is RESPONSIBLE for bleaching
`CaOCL_2+H_2O rarrCa^(+2)+CL^(-)+ClO+H^++OH^-`
Bleaching powder reacts with hot water and produces chloride and chlorate ions
`3ClO^(-)rarr2Cl^(-)+ClO^-`


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