Which gas is formed at the cathode in the chlor-alkali process?
Answer and explanation
Correct answer: Hydrogen
In the chlor-alkali process, brine is electrolysed. At the cathode, water molecules gain electrons and form hydrogen gas: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chloride ions form chlorine at the anode, not at the cathode. The hydrogen can be tested with a lighted splint, producing a characteristic pop. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
In the chlor-alkali process, brine is electrolysed. At the cathode, water molecules gain electrons and form hydrogen gas: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chloride ions form chlorine at the anode, not at the cathode. The hydrogen can be tested with a lighted splint, producing a characteristic pop. Therefore option A is correct.
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.
