Question

Which of the following is the most abundant gas present in air?

• A. Chlorofluorocarbons are responsible for ozone layer depletion
• B. Greenhouse effect is responsible for global warming
• C. Ozone layer does not permit infrared radiation from the sun to reach the earth
• D. Acid rains is mostly because of oxides of nitrogen and sulphur

Answer 1

Answer: (A), (C)

The correct options are
A Chlorofluorocarbons are responsible for ozone layer depletion
C Ozone layer does not permit infrared radiation from the sun to reach the earth

Nitrogen occupies 78% of air and oxygen occupies 21% of air, and hence nitrogen is the most abundant gas present in air. Carbon dioxide occupies 0.04% of air and the composition of water vapour varies from place to place.