Question

whats a chlor-alkali process ?

Answer 1

when electricity is passed through an aqueous solution sodium chloride (called brine) it decomposes to form sodium hydrooxide (NaOH). this process is called chlor-alkali 
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Answer 2

Answer:

Electrolysis of Brine

When electricity is passed through aqueous solution of sodium chloride (NaCl) also known as brine solution, it decomposes to form sodium hydroxide (NaOH). This process is called cholr-alkali process because of products formed chlor from chlorine and alkali from sodium hydroxide. Chlorine is given at anode and hydrogen at cathode, sodium hydroxide near cathode.