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Chemistry · Oct / Nov 2022 · Paper 11 · Question 18

5070Electrolysis

Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Which equation shows the reaction that occurs at the anode?

  1. A2Cl⁻ → Cl₂ + 2e⁻
  2. B2Cl⁻ + 2e⁻ → Cl₂
  3. C2H⁺ + 2e⁻ → H₂
  4. D4OH⁻ → O₂ + 2H₂O + 4e⁻

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Correct answer: A. 2Cl⁻ → Cl₂ + 2e⁻

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