Multiple choice

Which of the following gases is not a permanent gas of the atmosphere?

  1. Helium

  2. Xenon

  3. Argon

  4. Carbon mono oxide

  5. Neon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbon mono oxide is not a permanent part of the earth’s atmosphere. It is a pollutant but not a permanent part of the atmosphere.

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