Chemistry 0620 · IGCSE · Air quality and climate

Air quality and climate — practice question

An air sample made up of only four gases is analysed. Which row gives the percentage composition of the air sample?

  • A99.0%: $78.0\%$ nitrogen, $21.0\%$ oxygen; 0.9%: argon; 0.1%: carbon dioxide
  • B99.0%: $78.0\%$ nitrogen, $21.0\%$ oxygen; 0.9%: carbon dioxide; 0.1%: argon
  • C99.0%: $78.0\%$ oxygen, $21.0\%$ nitrogen; 0.9%: argon; 0.1%: carbon dioxide
  • D99.0%: $78.0\%$ oxygen, $21.0\%$ nitrogen; 0.9%: carbon dioxide; 0.1%: argon

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