Among the following gases, which is the one that is lighter than air?

Options :
  1. Carbon dioxide
  2. Oxygen
  3. Ammonia
  4. Chlorine
Answer and Explanation :-

Answer: Option 3


Carbon dioxide, Oxygen and Chlorine are all heavier or denser than air. Ammonia on the other hand is a colourless gas with a characteristic pungent smell and is lighter than air, its density being 0.589 times that of air.

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