(a) Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Write its chemical name and formula. How is it manufactured? Write the chemical equation for the reaction involved. Also list two other uses of the compound.
(b) Write the balanced chemical equation of chlor-alkali process.
a. The compound of calcium which is a yellowish white powder and is used for disinfecting drinking water is CaOCl2 commonly known as bleaching powder.
Its chemical name is – Calcium oxychloride
Formula - CaOCl2
The chemical equation for the reaction involved is: -
Ca(OH)2 + Cl2→ CaOCl2 + H2O
Two other uses of the compound are:-
1. It is used as an oxidising agent in many chemical industries.
2. It is used for bleaching cotton and linen in the textile industry, wood pulp bleaching and for bleaching washed clothes in the laundry.
b. The balanced chemical equation of chlor-alkali process is : -
2NaCl (aq) +2H2O (l) 
2NaOH (aq) + Cl2 (g) + H2 (g)