29. When electricity is passed through an aqueous solution of a substa

1.	29. When electricity is passed through an aqueous solution of a substance X, sodium hydroxide solution, chlorine gas and hydrogen gas are formed,(a) Write name and chemical formula of substance 'X'.(b) Mention the name of this process and justify this name.(c) identify the gasos liberated at anode and at cathode. Writo one use of each gas.(d) List two important uses of NaOH obtained in the process.
Answer» Answer : (a) X is aqueous solution of SODIUM chloride - $\bold{NaCl(aq)}$ $\rule{200}4$ (b) This process is named as chlor-alkali process because the MAIN products formed are chlorine and alkali(NaOH). $\rule{200}4$ (c) At ANODE $\bold{Cl_2}$ gas and at cathode $\bold{H_2}$ gas are produced. Uses :- Chlorine gas is used in WATER treatment. Hydrogen gas is used in the manufacture of ammonia. $\rule{200}4$ (d) Uses of NaOH :- Used in De-greasing of metals. Used in the manufacture of soaps and DETERGENTS Paper making. Used in manufacturing artificial fibres.