(a) Write the common name of `CaOCl_2` How it is prepared? Write the chemical equation of the reaction involved in the process. Give any two uses of it.
(ii) Write the chemical name of washing soda. How is it prepared? Give the relevant chemical equations.

Explanation

(a) The common name of `CaOCl_2` is Bleaching powder.
By passing chlorine into dry slaked lime `(Ca(OH)_2)`.
`Ca(OH)_2+Cl_2 to CaOCl_2+ H_2O`
Two uses:
(i) Used for bleaching cotton and linen in the textile industry and wood pulp in paper industry etc.
(ii) It is used for disinfecting drinking water.
(b) Washing soda:- `Na_2CO_3. 10 H_2O`
By heating baking soda, sodium carbonate is obtained, its recrystallisation gives washing soda.
`2NaHCO_3 to^(Heat) Na_2CO_3+H_2O+CO_2`
`Na_2CO_3+10H_2O toNa_2CO_3. 10 H_2O`