Which gas is produced at the cathode in the chlor-alkali process?
Answer and explanation
Correct answer: Hydrogen
The chlor-alkali process is the electrolysis of concentrated brine, or aqueous sodium chloride. At the cathode, water molecules gain electrons in a reduction reaction and form hydrogen gas and hydroxide ions: 2H2O + 2e− → H2 + 2OH−. Chlorine is formed at the anode, not the cathode, while carbon dioxide and ammonia are not products. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
The chlor-alkali process is the electrolysis of concentrated brine, or aqueous sodium chloride. At the cathode, water molecules gain electrons in a reduction reaction and form hydrogen gas and hydroxide ions: 2H2O + 2e− → H2 + 2OH−. Chlorine is formed at the anode, not the cathode, while carbon dioxide and ammonia are not products. Therefore option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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