Question

Arrange the following gases in increasing order of their percentage by volume in composition of air.

• A. Nitrogen < Oxygen < Argon < Carbon dioxide
• B. Carbon dioxide < Argon < Oxygen < Nitrogen
• C. Argon < Oxygen < Carbon dioxide < Nitrogen
• D. Carbon dioxide < Argon < Nitrogen < Oxygen

Answer 1

The correct option is B Carbon dioxide < Argon < Oxygen < Nitrogen

The atmosphere contains $78.084\%$ of nitrogen, $20.947\%$ of oxygen, $0.934\%$ of argon and $0.033\%$ of carbon dioxide. The composition of air in the atmosphere comprises of these four major gases. Other substances are present in a very little amount. When this balanced state is disturbed by natural events or human activity, it is then called "air-pollution".