Multiple choice

Which of the following gases does not form part of the atmosphere?

  1. Nitorgen

  2. Chlorine

  3. Oxygen

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorine is not naturally present in Earth's atmosphere as a stable gas component. The atmosphere primarily consists of nitrogen (78%), oxygen (21%), argon, carbon dioxide (0.04%), and trace gases. Chlorine exists as chlorofluorocarbons (CFCs) from human activity but not naturally. Option A has a typo ('Nitorgen' instead of 'Nitrogen').

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