CH-1720
Electrolysis of solutions
Chemistry · Secondary 4 · Medium · Electrolysis of solutions
Aqueous copper(II) sulfate is electrolysed using copper electrodes.
Which statement correctly describes what happens at the anode?
Which statement correctly describes what happens at the anode?
- Copper ions in solution are reduced to copper at the anode, so its mass increases.
- Copper atoms at the anode form Cu²⁺ ions and electrons, so its mass decreases.
- Water is decomposed at the anode to form hydrogen gas, so its mass decreases.
- Sulfate ions are discharged at the anode to form sulfur dioxide gas, so its mass increases.
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