Which gas is formed at the cathode in the chlor-alkali process?
Answer and explanation
Correct answer: Hydrogen
During electrolysis of brine, water is reduced at the negative cathode. The reduction reaction is 2H₂O + 2e⁻ → H₂ + 2OH⁻, so hydrogen gas is released at the cathode. Therefore option B is correct. Chlorine forms at the anode, while oxygen and carbon dioxide are not the expected cathode products in the chlor-alkali process.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
During electrolysis of brine, water is reduced at the negative cathode. The reduction reaction is 2H₂O + 2e⁻ → H₂ + 2OH⁻, so hydrogen gas is released at the cathode. Therefore option B is correct. Chlorine forms at the anode, while oxygen and carbon dioxide are not the expected cathode products in the chlor-alkali process.
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.
