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Chemistry · Oct / Nov 2025 · Paper 12 · Question 29

5070Air quality and climate

Dry air is a mixture of gases. 99% of the mixture is nitrogen and oxygen. What is in the highest abundance in the remaining 1%?

  1. Aargon
  2. Bchlorine
  3. Chydrogen
  4. Dwater vapour

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Correct answer: A. argon

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