Q.1 Fill in the blanks:-
of air is nitrogen and about
( By volume about
_ is oxygen
which
m) Incomplete burning of fuels produces_
is a gas
the oxygen carrying
(m) Carbon monoxide
capacity of the blood
(IV) Petroleum refineries are a major source of gaseous
pollutants ke and
used in refrigerators damages the ozone layer
of the atmosphere
(17) Ozone layer protects us from the harmful
rays of the sun
(1) of the world's population is without safe
drinking water.
(a) We can save water by remembering the RS_
- and
() Paid rain is formed by the oxidation followed by
dissolution of and gases in rain water.
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