In the chlor-alkali process, where is the sodium hydroxide mainly obtained?
Answer and explanation
Correct answer: In the solution
The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions are oxidised to chlorine gas: 2Cl⁻ → Cl₂ + 2e⁻. At the cathode, water is reduced to hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Sodium ions remain in solution and combine with hydroxide ions to give aqueous NaOH. Hence option A is correct; sodium metal is not deposited in this aqueous process.
Frequently asked questions
What is the correct answer to this question?
In the solution
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 are oxidised to chlorine gas: 2Cl⁻ → Cl₂ + 2e⁻. At the cathode, water is reduced to hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Sodium ions remain in solution and combine with hydroxide ions to give aqueous NaOH. Hence option A is correct; sodium metal is not deposited in this aqueous 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.
