What is the correct order of the gas formed at the anode and the gas formed at the cathode in the chlor-alkali process?
Answer and explanation
Correct answer: Chlorine and hydrogen
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: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Therefore the anode–cathode order is chlorine and hydrogen, making option A correct; option B reverses the electrodes, while C and D name gases not produced in this process.
Frequently asked questions
What is the correct answer to this question?
Chlorine and hydrogen
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: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Therefore the anode–cathode order is chlorine and hydrogen, making option A correct; option B reverses the electrodes, while C and D name gases not produced 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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