Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction ?
Correct answer: D. Oxidation of Cl- ions
- A. Oxidation of Na+ ions
- B. Reduction of Cl- ions
- C. Reduction of Na+ ions
- D. Oxidation of Cl- ions
Explanation
At the anode, chloride ions lose electrons and are oxidised to chlorine gas: 2Cl− → Cl2 + 2e−. Reduction occurs at the cathode, so options involving reduction are incorrect.
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