Q51 of 270 Page 98

State two important uses of bleaching powder.

For bleaching cotton and linen in the textile industry, for bleaching wood pulp in paper factories and for bleaching washed clothes in laundry;

(ii) As an oxidising agent in many chemical industries; and

(iii) For disinfecting drinking water to make it free of germs.

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

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

What is plaster of Paris? Write the chemical formula of plaster of Paris.

How is plaster of Paris prepared? Write chemical equation of the reaction involved.