Which gases are also formed when sodium hydroxide is prepared from sodium chloride solution by electrolysis?
Answer and explanation
Correct answer: Hydrogen and chlorine
The electrolysis of concentrated sodium chloride solution, called the chlor-alkali process, produces sodium hydroxide, hydrogen, and chlorine. At the cathode, water is reduced to hydrogen and hydroxide ions; at the anode, chloride ions are oxidised to chlorine. The sodium ions combine with hydroxide ions in solution to form NaOH. Therefore option A is correct, while the other gas pairs are not products of brine electrolysis.
Frequently asked questions
What is the correct answer to this question?
Hydrogen and chlorine
Why is this the correct answer?
The electrolysis of concentrated sodium chloride solution, called the chlor-alkali process, produces sodium hydroxide, hydrogen, and chlorine. At the cathode, water is reduced to hydrogen and hydroxide ions; at the anode, chloride ions are oxidised to chlorine. The sodium ions combine with hydroxide ions in solution to form NaOH. Therefore option A is correct, while the other gas pairs are not products of brine electrolysis.
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.
