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 sodium chloride solution, or brine. At the anode, chloride ions lose electrons and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Therefore, chlorine gas is released at the anode, so option B is correct. Hydrogen is produced at the cathode, while oxygen and carbon dioxide are not the expected products in this process.
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 sodium chloride solution, or brine. At the anode, chloride ions lose electrons and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Therefore, chlorine gas is released at the anode, so option B is correct. Hydrogen is produced at the cathode, while oxygen and carbon dioxide are not the expected products 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.
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