Question

State the electrode reaction at the respective electrodes during extraction of Al from Al2O3.

  • Electrolysis
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Answer

Reaction:

Al2O3 ⇌ 2Al3+ + 3O2-

Reaction at cathode:

2Al3+ + 6e– ⟶ 2Al

Reaction at anode:

3O2- – 6e– ⟶ 3[O]

3[O] + 3[O] ⟶ 3O2

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