Question

1)what is chlor alkali process
2)write its chemical equation which gas is evolved at cathode and anode

Answer 1

the answer of your question is:
1 chlorine
2. zinc at cathode and copper at anode

Answer 2

Electrolysis of NaCl gives NaOH , Cl2 and H2
Due to production of Chlorine and Sodium Hydroxide this process is known as Chlor Alkali process
Gas Evolved at Cathode:- H2
Anode:- Cl2