Chemistry 5070 · O Level · Air quality and climate

Air quality and climate — practice question

Which list includes only gases that are always found in unpolluted air?

  • Aoxygen, nitrogen, carbon dioxide, argon, carbon monoxide, nitrogen dioxide
  • Boxygen, nitrogen, carbon dioxide, argon, neon
  • Coxygen, nitrogen, carbon dioxide, nitrogen dioxide, ozone
  • Doxygen, nitrogen, carbon monoxide, methane, sulfur dioxide

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