A factory in Chile uses electrolysis to purify copper obtained from copper ore. The electrolyte is copper(II) sulfate solution. Which statement correctly describes what happens during this process?

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Question

A factory in Chile uses electrolysis to purify copper obtained from copper ore. The electrolyte is copper(II) sulfate solution. Which statement correctly describes what happens during this process?

Accepted Answer

Impure copper is the anode and pure copper is deposited at the cathode — Award 1 mark for correctly identifying the electrode arrangement. At the anode, impure copper dissolves (Cu → Cu²⁺ + 2e⁻), and at the cathode, pure copper is deposited (Cu²⁺ + 2e⁻ → Cu). D is incorrect — it reverses the electrodes. B is incorrect — pure copper is the cathode, not the anode. C is incorrect — the anode must be impure copper for purification to occur.

Answer

Both electrodes are made of pure copper

Answer

Pure copper is the anode and impure copper is deposited at the cathode

Answer

Impure copper is the anode and pure copper is deposited at the cathode

Answer

Impure copper is the cathode and pure copper is deposited at the anode

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