Which gas is formed at the cathode in the chlor alkali process?
Answer and explanation
Correct answer: Hydrogen
In the chlor-alkali process, brine (aqueous sodium chloride solution) is electrolysed. At the cathode, water is reduced to form hydrogen gas: \(2H_2O + 2e^- \rightarrow H_2 + 2OH^-\). Chlorine is produced at the anode, so option B is incorrect. Exam tip: reduction always takes place at the cathode during electrolysis.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
In the chlor-alkali process, brine (aqueous sodium chloride solution) is electrolysed. At the cathode, water is reduced to form hydrogen gas: \(2H_2O + 2e^- \rightarrow H_2 + 2OH^-\). Chlorine is produced at the anode, so option B is incorrect. Exam tip: reduction always takes place at the cathode during electrolysis.
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.
