Which gas is formed at the cathode in the chlor-alkali process?
Answer and explanation
Correct answer: Hydrogen
In the chlor-alkali process, aqueous sodium chloride (brine) is electrolysed. At the cathode, water molecules gain electrons and are reduced, producing hydrogen gas: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Thus option A is correct. Chlorine is formed at the anode by oxidation of chloride ions; nitrogen and sulphur dioxide are not products of brine electrolysis. Hydrogen can be tested with a lighted splint, which gives a pop sound.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
In the chlor-alkali process, aqueous sodium chloride (brine) is electrolysed. At the cathode, water molecules gain electrons and are reduced, producing hydrogen gas: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Thus option A is correct. Chlorine is formed at the anode by oxidation of chloride ions; nitrogen and sulphur dioxide are not products of brine electrolysis. Hydrogen can be tested with a lighted splint, which gives a pop sound.
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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