O-LevelChemistryElectrolysis5070/11 · Oct/Nov 2021 · Q341 Mark

In the extraction of aluminium from aluminium oxide, the following three reactions take place. 1 Al3+ + 3e– → Al 2 2O2– → O2 + 4e– 3 C + O2 → CO2 Which reactions take place at the positive electrode?

A1 only

B2 only

C1 and 3

D2 and 3

✓ Correct answer

D: 2 and 3

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 1, question 34.

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