The process in which electrolysis is done to brine ( solution of common salt in water) to obtain chlorine gas and Sodium hydroxide at anode and cathode respectivity along with hydrogen is calld chlor-alkali process.

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On electrolysis of aqueous solution (brine solution) of sodium chloride the sodium hydroxide build up near the cathode where water to reduced to hydrogen gas and hydroxide ion this process is called Chlor – Alkali process
Process of electrolysis of concentration of nacl solution is called brine solution and hydrogen form on cathode and chlorine on anode this process is called chlor alkali
The process of electrolysis of brine solution is called chlor alkali