Electrolysis Quiz
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5 questions, one answer each
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1. Which statement correctly defines electrolysis?
- A. The decomposition of an ionic compound when molten or in aqueous solution by the passage of an electric current
- B. The combination of two elements to form a compound using electrical energy
- C. The movement of electrons through a metallic conductor only
- D. The separation of a mixture using an electric field
2. During the electrolysis of molten lead bromide, what is produced at the cathode?
- A. Bromine gas
- B. Lead metal
- C. Lead bromide vapour
- D. Hydrogen gas
3. In the electrolysis of brine (sodium chloride solution), which substance is produced at the anode?
- A. Sodium metal
- B. Chlorine gas
- C. Hydrogen gas
- D. Oxygen gas
4. Why is copper deposited at the cathode during the electrolysis of copper sulphate solution using copper electrodes?
- A. Copper ions are repelled by the negative cathode electrode
- B. Copper ions (Cu²⁺) are attracted to the cathode where they gain electrons and are reduced to copper metal
- C. Sulphate ions move to the cathode and release copper
- D. The copper anode dissolves and the ions travel through the solution to deposit at the cathode
5. In the electrolysis of dilute sulphuric acid, oxygen is produced at the anode. Explain this in terms of oxidation and reduction.
- A. Hydroxide ions (OH⁻) are oxidised, losing electrons: 4OH⁻ → O₂ + 2H₂O + 4e⁻
- B. Water molecules are reduced at the anode to produce oxygen gas
- C. Sulphate ions are oxidised to release oxygen atoms
- D. Hydrogen ions gain electrons to form oxygen gas