Air and Atmosphere
Ammonia is used to make compounds such as
ammonium sulfate
ammonium nitrate
all of these
nitric acid
all of these
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There is no boundary between atmosphere and space, so the density of atmosphere decreases withA. same height
B. increasing altitude
C. constant height
D. decreasing height
In fish, respiration takes place through
A. gills
B. lungs
C. throat
D. tail
Intake of carbon dioxide and giving out of oxygen is the only process named
A. photosynthesis
B. respiration
C. rusting
D. excretion
Nitrogen is obtained from the fractional distillation of liquefied air at about
A. 196ยฐC
B. 186ยฐC
C. 176ยฐC
D. 166ยฐC
The percentage composition of oxygen in air is
A. 21%
B. 31%
C. 41%
D. 51%
Oxygen is used in the manufacture of
A. glass
B. medicine
C. metal
D. chemical
The condensation point of oxygen gas is
A. (-113ยฐC)
B. (-133ยฐC)
C. (-183ยฐC)
D. (-143ยฐC)
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