Electrolysis of Sodium Chloride Quiz
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5 questions, one answer each
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1. What is produced at the cathode when concentrated sodium chloride solution is electrolysed?
- A. Sodium metal
- B. Hydrogen gas
- C. Chlorine gas
- D. Oxygen gas
2. What is produced at the anode when concentrated sodium chloride solution is electrolysed?
- A. Hydrogen gas
- B. Oxygen gas
- C. Chlorine gas
- D. Sodium chloride crystals
3. Which two ions are left in solution, forming sodium hydroxide, after brine electrolysis?
- A. H⁺ and Cl⁻
- B. Na⁺ and OH⁻
- C. Na⁺ and Cl⁻
- D. H⁺ and OH⁻
4. Which industry would most directly rely on the chlorine produced by brine electrolysis?
- A. Fertiliser production using ammonia
- B. Bleach and PVC plastic manufacturing
- C. Aluminium extraction
- D. Steel manufacturing
5. A factory electrolyses molten sodium chloride instead of its aqueous solution. Compared with electrolysing brine, what is the key difference in products?
- A. No difference — the same three products form either way
- B. Molten electrolysis gives sodium metal and chlorine, with no hydrogen or sodium hydroxide, because there is no water to supply H⁺/OH⁻ ions
- C. Molten electrolysis gives only hydrogen gas
- D. Molten electrolysis produces more sodium hydroxide than the aqueous version