In the process of making sodium hydroxide from sodium chloride solution, which gases are also produced?
Answer and explanation
Correct answer: Hydrogen and chlorine
The chlor-alkali process is the electrolysis of concentrated sodium chloride solution, or brine. At the cathode, water produces hydrogen gas and hydroxide ions; at the anode, chloride ions are oxidised to chlorine gas. The remaining sodium ions combine with hydroxide ions to form sodium hydroxide. Thus 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 chlor-alkali process is the electrolysis of concentrated sodium chloride solution, or brine. At the cathode, water produces hydrogen gas and hydroxide ions; at the anode, chloride ions are oxidised to chlorine gas. The remaining sodium ions combine with hydroxide ions to form sodium hydroxide. Thus 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: Acids, Bases, and Salts.
