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Chemistry · May / June 2026 · Paper 12 · Question 10

5070Electrolysis

Concentrated and dilute aqueous XCl are electrolysed separately using inert electrodes. X is a more reactive metal than sodium. Which row shows the products at the cathode and the anode?

  1. Aconcentrated aqueous XCl: product at the cathode hydrogen, product at the anode chlorine; dilute aqueous XCl: product at the cathode X, product at the anode oxygen
  2. Bconcentrated aqueous XCl: product at the cathode hydrogen, product at the anode oxygen; dilute aqueous XCl: product at the cathode X, product at the anode chlorine
  3. Cconcentrated aqueous XCl: product at the cathode hydrogen, product at the anode chlorine; dilute aqueous XCl: product at the cathode hydrogen, product at the anode oxygen
  4. Dconcentrated aqueous XCl: product at the cathode X, product at the anode oxygen; dilute aqueous XCl: product at the cathode hydrogen, product at the anode chlorine

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Correct answer: C. concentrated aqueous XCl: product at the cathode hydrogen, product at the anode chlorine; dilute aqueous XCl: product at the cathode hydrogen, product at the anode oxygen

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