The substance which on treatment with chlorine yields bleaching powder is:

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Quicklime

Chalk

Slaked lime

Bleaching powder

answer is B.

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Detailed Solution

Slaked lime

Ca (O H_{2})

on treatment with chlorine yields bleaching powder.
By adding chlorine to slaked lime [

Ca (O H_{2})

], bleaching powder (

CaOC l_{2}

) is produced. Bleaching powder is widely used for bleaching purposes in the textile and paper industries. It is also used in various chemical industries for its role as an oxidising agent. It is majorly used in the disinfection of water. The reaction for the production of bleaching powder from slaked lime and chlorine is:

{Ca (OH)_{2} + C l_{2} \to CaOC l_{2} + H_{2} O}_{}

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