What is produced at the cathode when concentrated sodium chloride solution (brine) is electrolysed?
Answer and explanation
Correct answer: B. Hydrogen
- Step 1: Hydrogen ions are discharged in preference to sodium ions at the cathode. Answer: Hydrogen. Why not the others: Sodium: Sodium is more reactive than hydrogen and stays as ions in water. Chlorine: Chlorine forms at the anode. Oxygen: Oxygen forms at the anode in dilute solutions.
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