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Chemistry · Oct / Nov 2021 · Paper 12 · Question 3

5070Air quality and climate

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

  1. Aby decomposition of calcium carbonate
  2. Bby decomposition of hydrogen peroxide
  3. Cby filtration of liquid air
  4. Dby fractional distillation of liquid air

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Correct answer: D. by fractional distillation of liquid air

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