Which Of The Following Gas Is Lighter Than Air? (A) Oxygen. (B) Ammonia. (C) Chlorine. (D) Carbon Dioxide.

The correct answer is (B) Ammonia.

The vapour density of Ammonia is 8.5g, which is 0.589 times that of air. Therefore it is lighter than air.

The vapour density of oxygen is 16.

The vapour density of chlorine is 35.5

The vapour density of carbon dioxide is 22.

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