Why is an aqueous solution of sodium chloride used in the chlor-alkali process?
Answer and explanation
Correct answer: It gives chlorine, hydrogen and sodium hydroxide
The aqueous solution of sodium chloride is called brine. During electrolysis, chloride ions are oxidised at the anode to form chlorine, while water is reduced at the cathode to form hydrogen and hydroxide ions. The sodium ions combine with hydroxide ions to produce sodium hydroxide in solution. Thus option A lists all three useful products; the other options are unrelated.
Frequently asked questions
What is the correct answer to this question?
It gives chlorine, hydrogen and sodium hydroxide
Why is this the correct answer?
The aqueous solution of sodium chloride is called brine. During electrolysis, chloride ions are oxidised at the anode to form chlorine, while water is reduced at the cathode to form hydrogen and hydroxide ions. The sodium ions combine with hydroxide ions to produce sodium hydroxide in solution. Thus option A lists all three useful products; the other options are unrelated.
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.
