Which gas is formed at the anode in the chlor-alkali process?
Answer and explanation
Correct answer: Chlorine
The chlor-alkali process involves electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Therefore, chlorine gas is released at the anode. Hydrogen is produced at the cathode, while sodium hydroxide remains in solution; oxygen and carbon dioxide are not the expected products of this process.
Frequently asked questions
What is the correct answer to this question?
Chlorine
Why is this the correct answer?
The chlor-alkali process involves electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Therefore, chlorine gas is released at the anode. Hydrogen is produced at the cathode, while sodium hydroxide remains in solution; oxygen and carbon dioxide are not the expected products of 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.
