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Chemistry · Oct / Nov 2017 · Paper 11 · Question 14

5070Electrolysis

Aluminium is produced by the electrolysis of molten aluminium oxide. What is the correct equation for the reaction at the positive electrode?

  1. AAl → Al3+ + 3e–
  2. BAl3+ + 3e– → Al
  3. CO2 + 4e– → 2O2–
  4. D2O2– → O2 + 4e–

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Correct answer: D. 2O2– → O2 + 4e–

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