Lesson 4.4.3.2

4.4.3.2 Electrolysis of molten ionic compounds Quiz: AQA Chemistry, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.4.3.2, Electrolysis of molten ionic compounds: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 4: Chemical changes, written with Revision Ninja.

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The 20 questions

  1. What metal is formed at the cathode during the electrolysis of molten lead bromide?

    • Zinc
    • Hydrogen
    • Bromine
    • Lead

  2. What non-metal is formed at the anode when molten lead bromide is electrolysed?

    • Oxygen
    • Bromine
    • Lead
    • Hydrogen

  3. What type of electrodes are usually used when electrolysing molten compounds?

    • Inert electrodes
    • Reactive metals
    • Solutions
    • Gases

  4. Molten zinc chloride is electrolysed. Which product forms at the anode?

    • Chlorine
    • Oxygen
    • Zinc
    • Hydrogen

  5. Molten magnesium chloride is electrolysed. Which product forms at the cathode?

    • Hydrogen
    • Oxygen
    • Magnesium
    • Chlorine

  6. What occurs when a molten binary ionic compound undergoes electrolysis?

    • Electrons condense
    • Molecules evaporate
    • Atoms dissolve
    • Ions are discharged

  7. Molten sodium iodide is electrolysed. Which product forms at the anode?

    • Oxygen
    • Hydrogen
    • Iodine
    • Sodium

  8. What is always produced at the cathode in the electrolysis of a molten binary ionic compound?

    • A metal
    • A gas
    • A non-metal
    • Water

  9. Which is a safer alternative to lead bromide for practical work?

    • Liquid bromine
    • Anhydrous zinc chloride
    • Concentrated sulfuric acid
    • Molten lead bromide

  10. In molten lead bromide, which electrode do lead ions move towards?

    • The anode
    • Both electrodes
    • The cathode
    • Neither electrode

  11. At the anode in molten lead bromide, what happens to bromide ions?

    • They lose electrons
    • They gain electrons
    • They become metals
    • They remain unchanged

  12. Why must an ionic compound be molten for electrolysis to occur?

    • Covalent bonds form
    • Electrons are destroyed
    • Atoms break apart
    • Ions move freely

  13. Which of these is a binary ionic compound?

    • Sodium sulfate
    • Calcium carbonate
    • Ammonium chloride
    • Lead bromide

  14. What does electrolysis of molten lead bromide require for its ions to move?

    • Melting the compound
    • Cooling below zero
    • Adding a catalyst
    • Adding water

  15. Which material is an inert electrode?

    • Copper
    • Iron
    • Graphite
    • Zinc

  16. What is produced at the anode during the electrolysis of molten potassium bromide?

    • Oxygen
    • Bromine
    • Hydrogen
    • Potassium

  17. Ions discharged at the cathode during electrolysis of molten lead bromide carry which charge?

    • Neutral
    • Variable
    • Negative
    • Positive

  18. Why is anhydrous zinc chloride often used as a safer alternative in electrolysis practicals?

    • Chloride is unreactive
    • It conducts better
    • Lead compounds toxic
    • Zinc melts faster

  19. Which ion is discharged at the cathode in molten lead bromide?

    • Hydrogen ion
    • Bromide ion
    • Lead ion
    • Oxide ion

  20. Where is the metal produced during the electrolysis of a molten binary ionic compound?

    • At the cathode
    • On the container
    • In the electrolyte
    • At the anode

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