What is one important use of the gas formed at the anode in the chlor-alkali process?
Answer and explanation
Correct answer: Disinfecting water
The governing concept is electrolysis of concentrated brine in the chlor-alkali process. At the anode, chloride ions are oxidised and chlorine gas is released: 2Cl⁻ → Cl₂ + 2e⁻. Chlorine is a strong disinfectant because it forms substances such as hypochlorous acid in water, which destroy many disease-causing microorganisms. Hence chlorine is used to disinfect drinking-water supplies and swimming pools, making option B correct. Carbon dioxide, not chlorine, is associated with raising cakes.
Frequently asked questions
What is the correct answer to this question?
Disinfecting water
Why is this the correct answer?
The governing concept is electrolysis of concentrated brine in the chlor-alkali process. At the anode, chloride ions are oxidised and chlorine gas is released: 2Cl⁻ → Cl₂ + 2e⁻. Chlorine is a strong disinfectant because it forms substances such as hypochlorous acid in water, which destroy many disease-causing microorganisms. Hence chlorine is used to disinfect drinking-water supplies and swimming pools, making option B correct. Carbon dioxide, not chlorine, is associated with raising cakes.
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.
