Which gas is formed at the cathode in the chlor-alkali process?
Answer and explanation
Correct answer: Hydrogen
In chlor-alkali electrolysis, the cathode is the site of reduction. Water molecules gain electrons there and produce hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chlorine is released at the anode from chloride ions. Nitrogen and sulphur dioxide do not arise from brine electrolysis, so hydrogen is the correct answer.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
In chlor-alkali electrolysis, the cathode is the site of reduction. Water molecules gain electrons there and produce hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chlorine is released at the anode from chloride ions. Nitrogen and sulphur dioxide do not arise from brine electrolysis, so hydrogen is the correct answer.
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.
