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Chemistry · May / June 2017 · Paper 11 · Question 15

5070Electrolysis

Aluminium is obtained by the electrolysis of molten aluminium oxide. [diagram of electrolysis cell] Which row shows the electrode at which aluminium is formed and the correct equation for its formation?

  1. Aanode; Al3+ + 3e– → Al
  2. Banode; Al3+ – 3e– → Al
  3. Ccathode; Al3+ + 3e– → Al
  4. Dcathode; Al3+ – 3e– → Al

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Correct answer: C. cathode; Al3+ + 3e– → Al

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