In the chlor-alkali process, which product is formed at the cathode during electrolysis of brine?
Answer and explanation
Correct answer: Hydrogen gas
The governing concept is electrolysis of concentrated aqueous sodium chloride, or brine. At the cathode, water is reduced more readily than sodium ions, producing hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chlorine forms at the anode, while sodium hydroxide remains in solution. Therefore, option A is correct; sodium metal is not deposited from the aqueous solution.
Frequently asked questions
What is the correct answer to this question?
Hydrogen gas
Why is this the correct answer?
The governing concept is electrolysis of concentrated aqueous sodium chloride, or brine. At the cathode, water is reduced more readily than sodium ions, producing hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chlorine forms at the anode, while sodium hydroxide remains in solution. Therefore, option A is correct; sodium metal is not deposited from the aqueous solution.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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