Which gas in air is essential for respiration?
Oxygen
Nitrogen
Carbon dioxide
Carbon monoxide
Oxygen is essential for respiration in all the living organisms.
Which of the following gas does not contribute to the formation of acid rain ?
(a) nitrogen monoxide
(b) carbon monoxide
(c) sulphur dioxide
(d) nitrogen dioxide
Which of the following air pollutant reduces the oxygen-carrying capacity of blood to a large extent?
(a) carbon dioxide
(b) nitrogen monoxide
(c) carbon monoxide
(d) sulphur dioxide
Incomplete burning of fuel produces __ (Carbon dioxide/Carbon monoxide) which is a Poisonous gas.