Which of the following is usually not an air-pollutant?
A). Hydrocarbons
B). Sulphur dioxide
C). Carbon dioxide
D). Nitrous oxide
Of the following which one pollutes the air of a big city ?
A). Copper
B). Chromium
C). Lead
D). Calcium
Of the following, which one pollutes the air of a big city ?
A). Copper
B). Chromium
C). Lead
D). Cadmium
The acid rain destroys vegetations because it contains
A). Nitric acid
B). Ozone
C). Carbon monoxide
D). Sulphuric acid
The constituents of automobile exhaust that can cause cancer is/are :
A). Oxides of nitrogen
B). Carbon monoxide
C). Polycyclic hydrocarbons
D). Lead