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Question

(a) What is bleaching powder? How is bleaching powder prepared? Write the chemical equation of the reaction involved in the preparation of bleaching powder.

(b) What happens when bleaching powder reacts with the dilute sulphuric acid? Give the equation of the reaction involved.

(c) State two important uses of bleaching powder.

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Solution

a) When chlorine gas is passed over dry slaked lime in presence of electricity, then calcium oxychloride is prepared.


Ca(OH)2+Cl2CaOCl2

b)Bleaching powder is CaOCl2 (calcium oxychloride). It gives the strong smell of chlorine. It reacts with sulphuric acid to form calcium sulphate and chlorine gas is liberated.
Reaction is given below -
CaOCl2+H2SO4CaSO4+Cl2+H2O

c)Uses:

●It is used as a bleaching agent in the textile industry and paper factories.
● It is used as an oxidising agent in chemical industries.
● It is used as a disinfectant for drinking water, to make it germ-free.


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