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Aluminium is extracted by the electrolysis of molten aluminium oxide, Al₂O₃ - OCR Gateway - GCSE Chemistry - Question 8 - 2018 - Paper 1
Question 8
Aluminium is extracted by the electrolysis of molten aluminium oxide, Al₂O₃. Which equation shows the reaction at the anode in this electrolysis? A 4OH⁻ - 4e⁻ → O₂ ... show full transcript
Worked Solution & Example Answer:Aluminium is extracted by the electrolysis of molten aluminium oxide, Al₂O₃ - OCR Gateway - GCSE Chemistry - Question 8 - 2018 - Paper 1
Step 1
Which equation shows the reaction at the anode in this electrolysis?
Answer
In the electrolysis of molten aluminium oxide (Al₂O₃), the anode reaction involves the oxidation of oxide ions (O²⁻). At the anode, oxide ions lose electrons to form oxygen gas. The correct equation for this reaction is:
Thus, the correct answer is option D.