The presence of ________ in air controls the process of burning.
Oxygen
Nitrogen
Sulphur dioxide
Hydrogen
The presence of nitrogen gas in air controls the process of burning.
The process of burning a substance in the presence of oxygen is called ___.
The constituent of polluted air which contributes in producing acid rain is:
(a) nitrogen
(b) sulphur dioxide
(c) oxygen
(d) argon
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