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Chemistry · Oct / Nov 2022 · Paper 11 · Question 19

5070Electrolysis

Which pair of equations correctly represents the reactions taking place at the anode and at the cathode during the electrolysis of molten silver bromide?

  1. Aanode: 2Br– → Br2 + 2e–; cathode: Ag2+ + 2e– → Ag
  2. Banode: Br2– → Br2 + 2e–; cathode: Ag+ + e– → Ag
  3. Canode: 2Br– → Br2 + 2e–; cathode: Ag+ + e– → Ag
  4. Danode: Ag+ + e– → Ag; cathode: 2Br– → Br2 + 2e–

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Correct answer: C. anode: 2Br– → Br2 + 2e–; cathode: Ag+ + e– → Ag

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