A aqueous solution of `NaCl` on electrolysis gives `H_(2)(g), Cl_(2)(g)`, and `NaOH` according to the reaction :
`2Cl^(-)(aq)+2H_(2)Orarr 2OH^(-)(aq)+H_(2)(g)+Cl_(2)(g)`
A direct current of 25A with `62%` efficiency is passed through 20 L NaCl solution (`20%` by weight). (1) Give the reaction occurring at anode and cathode.

Explanation

(1) `2Cl^(-)(aq)+2H_(2)Orarr 2OH^(-)(aq)+H_(2)(g)+Cl_(2)(g)`
`"Cathode reaction : "2H_(2)O+2e rarr 2OH^(-)+H_(2)`
`"Anode reaction : "2Cl^(-)rarr Cl_(2)+2e`