Lesson 5.4.3.4

5.4.3.4 Electrolysis of aqueous solutions Quiz: AQA Combined Science, Unit 11

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.4.3.4, Electrolysis of aqueous solutions: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 11: Chemical changes, written with Revision Ninja.

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The 20 questions

  1. During aqueous electrolysis, when is hydrogen gas produced at the cathode?

    • Metal is more reactive
    • Metal is less reactive
    • Solution is very concentrated
    • Solution contains a halide

  2. At the anode during aqueous electrolysis, oxygen is produced unless the solution contains what?

    • Metal ions
    • Sulfate ions
    • Halide ions
    • Hydrogen ions

  3. Electrolysis of aqueous sodium chloride with inert electrodes gives which product at the anode?

    • Hydrogen
    • Oxygen
    • Sodium
    • Chlorine

  4. Electrolysis of aqueous sodium chloride with inert electrodes gives which product at the cathode?

    • Hydrogen
    • Oxygen
    • Chlorine
    • Sodium

  5. Electrolysis of aqueous copper sulfate with inert electrodes gives which product at the cathode?

    • Copper
    • Oxygen
    • Hydrogen
    • Sulfur

  6. Electrolysis of aqueous copper sulfate with inert electrodes gives which product at the anode?

    • Hydrogen
    • Oxygen
    • Sulfur dioxide
    • Chlorine

  7. Which ions from water are discharged during the electrolysis of aqueous solutions?

    • Hydrogen and hydroxide
    • Sodium and chloride
    • Hydrogen and sulfate
    • Oxygen and hydrogen

  8. What is the product at the cathode when aqueous potassium iodide is electrolysed?

    • Potassium
    • Iodine
    • Oxygen
    • Hydrogen

  9. What is the product at the anode when aqueous potassium iodide is electrolysed?

    • Iodine
    • Potassium
    • Hydrogen
    • Oxygen

  10. What is produced at the anode when dilute sulfuric acid is electrolysed?

    • Oxygen
    • Sulfur
    • Hydrogen
    • Sulfur dioxide

  11. What is the product at the anode when aqueous potassium bromide is electrolysed?

    • Hydrogen
    • Potassium
    • Oxygen
    • Bromine

  12. Which product forms at the cathode when aqueous silver nitrate is electrolysed with inert electrodes?

    • Silver
    • Nitrogen
    • Oxygen
    • Hydrogen

  13. Why is hydrogen formed at the cathode when electrolysing sodium chloride solution?

    • Chloride ions are discharged
    • Sodium is too reactive
    • Sodium ions are absent
    • Water is insoluble

  14. What type of electrodes must be used to investigate the products of aqueous electrolysis?

    • Iron electrodes
    • Reactive electrodes
    • Inert electrodes
    • Copper electrodes

  15. What type of electrodes must be used when investigating aqueous electrolysis?

    • Carbon steel
    • Copper foil
    • Inert electrodes
    • Reactive metal

  16. In the electrolysis of aqueous sodium chloride, which species is oxidised at the anode?

    • Sodium ions
    • Water
    • Hydrogen ions
    • Chloride ions

  17. What is produced at the anode during the electrolysis of concentrated sodium chloride solution?

    • Sodium
    • Hydrogen
    • Oxygen
    • Chlorine

  18. Which solution gives copper metal at the cathode when electrolysed with inert electrodes?

    • Copper(II) sulfate solution
    • Dilute sulfuric acid
    • Sodium chloride solution
    • Potassium iodide solution

  19. Electrolysis of 0.1 mol of copper sulfate solution with inert electrodes deposits how many moles of copper?

    • 0.05 mol
    • 0.2 mol
    • 0.1 mol
    • 0.01 mol

  20. How many grams of copper are deposited when 0.2 mol of electrons passes through copper(II) ions? (Cu = 64)

    • 6.4 g
    • 12.8 g
    • 0.1 g
    • 3.2 g

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