Where is hydrogen gas obtained in the chlor-alkali process?
Answer and explanation
Correct answer: At the cathode
During electrolysis of brine, water is reduced at the cathode, where reduction means gain of electrons. The cathode reaction may be written as 2H₂O + 2e⁻ → H₂ + 2OH⁻. Therefore hydrogen gas is collected at the cathode. Chlorine forms at the anode, while sodium hydroxide remains in the solution, so the other choices are incorrect.
Frequently asked questions
What is the correct answer to this question?
At the cathode
Why is this the correct answer?
During electrolysis of brine, water is reduced at the cathode, where reduction means gain of electrons. The cathode reaction may be written as 2H₂O + 2e⁻ → H₂ + 2OH⁻. Therefore hydrogen gas is collected at the cathode. Chlorine forms at the anode, while sodium hydroxide remains in the solution, so the other choices are incorrect.
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.
