In the laboratory preparation of oxygen the gas... - JAMB Chemistry 2018 Question
In the laboratory preparation of oxygen, the gas cannot be collected by displacement of air because
A
the density of oxygen is greater than that of air
B
the density of air is nearly the same as that of oxygen
C
oxygen is a component of air
D
air is an impure substance
correct option: a
Oxygen is collected by the downward displacement of water because it is only slightly soluble in water and is less dense than water. It cannot be collected by downward displacement of air since oxygen will get mixed with other gases in air.
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