O-LevelChemistryChemistry of the Environment5070/12 · Oct/Nov 2021 · Q31 Mark

Pure oxygen is needed by many industries. How is pure oxygen obtained in large amounts for such uses?

Aby decomposition of calcium carbonate

Bby decomposition of hydrogen peroxide

Cby filtration of liquid air

Dby fractional distillation of liquid air

✓ Correct answer

D: by fractional distillation of liquid air

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 2, question 3.

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