Which gas is formed at the anode in the chlor-alkali process?
Answer and explanation
Correct answer: Chlorine
The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons: 2Cl⁻ → Cl₂ + 2e⁻, so chlorine gas is released there. At the cathode, water produces hydrogen gas, while sodium hydroxide remains in solution. Therefore option B is correct; hydrogen belongs at the cathode, not the anode.
Frequently asked questions
What is the correct answer to this question?
Chlorine
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: 2Cl⁻ → Cl₂ + 2e⁻, so chlorine gas is released there. At the cathode, water produces hydrogen gas, while sodium hydroxide remains in solution. Therefore option B is correct; hydrogen belongs at the cathode, not the anode.
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.
