Electrolysis of Copper Sulfate Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which ions are attracted to the cathode during electrolysis of copper sulfate solution?
- A. SO₄²⁻ and OH⁻
- B. Cu²⁺ and H⁺
- C. Cu²⁺ and SO₄²⁻
- D. H⁺ and OH⁻ only
2. What forms at the cathode when copper sulfate solution is electrolysed with inert electrodes?
- A. Hydrogen gas
- B. Copper metal
- C. Oxygen gas
- D. Sulfur dioxide
3. What gas is produced at the anode during this electrolysis?
- A. Hydrogen
- B. Chlorine
- C. Oxygen
- D. Sulfur dioxide
4. A student observes the blue colour of copper sulfate solution fading during electrolysis. What is the best explanation?
- A. Sulfate ions are being converted to sulfur dioxide
- B. Copper(II) ions are being removed from solution and deposited as copper metal
- C. The solution is becoming more concentrated
- D. Water is evaporating from the solution
5. A student mixes up the electrode reactions and writes '2H⁺ + 2e⁻ → H₂' for the cathode in copper sulfate electrolysis. Explain why this is incorrect.
- A. Hydrogen ions cannot be reduced under any conditions
- B. Copper is less reactive than hydrogen, so Cu²⁺ is discharged in preference to H⁺
- C. The equation is unbalanced
- D. Hydrogen gas cannot form in aqueous solution