The gas that can be collected by downward displacement of air is
-
A.
chlorine -
B.
sulphur (IV) oxide -
C.
carbon (IV) oxide -
D.
ammonia
Correct Answer: Option D
Explanation
Upward delivery works well for hydrogen and ammonia, which are both less densed than air. Sometimes, they are collected over water.
There is an explanation video available below.