Question

Which of the following is true about air?
(i) Air is a mixture of several gases.
(ii) Air exerts pressure.
(iii) The composition of air is uniform in all places.

• A. Only (i) and (ii)
• B. Only (ii) and (iii)
• C. Only (i) and (iii)
• D. All of these

Answer 1

The correct option is A

Only (i) and (ii)

Air is a mixture of several gases and exerts pressure. The composition of air is not uniform and changes from place to place. For example: in highly polluted areas, the air contains a higher concentration of air pollutants such as carbon dioxide, carbon monoxide and dust particles.