In electrolysis of brine, which product is formed at the anode and what is one use of it?
Answer and explanation
Correct answer: Chlorine and water purification
The governing process is the chlor-alkali process, in which concentrated aqueous sodium chloride (brine) is electrolysed. Chloride ions move to the anode and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Thus chlorine gas is formed at the anode and is used for disinfecting or purifying water, making option B correct. Hydrogen is produced at the cathode, not the anode; sodium metal is not deposited from aqueous brine, and carbon dioxide is unrelated.
Frequently asked questions
What is the correct answer to this question?
Chlorine and water purification
Why is this the correct answer?
The governing process is the chlor-alkali process, in which concentrated aqueous sodium chloride (brine) is electrolysed. Chloride ions move to the anode and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Thus chlorine gas is formed at the anode and is used for disinfecting or purifying water, making option B correct. Hydrogen is produced at the cathode, not the anode; sodium metal is not deposited from aqueous brine, and carbon dioxide is unrelated.
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.
