Answer :
When a concentrated solution of sodium chloride is electrolyzed, it forms sodium hydroxide (NaOH), chlorine gas and hydrogen gas.
Chlorine gas is formed at the anode (positive charge) and hydrogen gas at the cathode (negative charge)
The reaction that takes place given as:
2NaCl + 2H2O → 2NaOH + Cl2 + H2
The above reaction is called chlor-alkali process.
The electrolysis of a concentrated solution of sodium chloride known as chlor- alkali process because of the products formed:
a. The products formed in this reaction are NaOH (a strong base/alkali), chlorine and hydrogen gas.
b. “Chlor” means chlorine and “alkali” means NaOH.
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