When electricity is passed through a concentrated solution of sodium chloride (called brine), it decomposes to form sodium hydroxide, chlorine and hydrogen gas.
(i) Use of Sodium hydroxide $\left(\mathrm{NaOH}\right)$ : It is used for making soaps and detergents.
(ii) Use of Chlorine $\left({\mathrm{Cl}}_2\right)$ : It is used in the production of bleaching powder.
(iii) Use of hydrogen gas $\left({\mathrm{H}}_2\right)$ : It is used to make ammonia for fertilisers; used as a fuel or margarine.