In the electrolysis of brine in the chlor-alkali process, what is the correct order of gases formed at anode and cathode?
Answer and explanation
Correct answer: Chlorine at anode, hydrogen at cathode
The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons and form chlorine gas: 2Cl⁻ → Cl₂ + 2e⁻. At the cathode, water gains electrons and produces hydrogen gas. Sodium hydroxide remains in solution. Thus option B gives the correct anode-to-cathode order; the other options reverse or name products that are not formed in this process.
Frequently asked questions
What is the correct answer to this question?
Chlorine at anode, hydrogen at cathode
Why is this the correct answer?
The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons and form chlorine gas: 2Cl⁻ → Cl₂ + 2e⁻. At the cathode, water gains electrons and produces hydrogen gas. Sodium hydroxide remains in solution. Thus option B gives the correct anode-to-cathode order; the other options reverse or name products that are not formed in this 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.
