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The gas that can be collected by downward displ... - JAMB Chemistry 2017 Question

The gas that can be collected by downward displacement of air is

A
chlorine
B
sulphur (IV) oxide
C
carbon (IV) oxide
D
ammonia
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Correct Option: D

Upward delivery works well for hydrogen and ammonia, which are both less densed than air. Sometimes, they are collected over water.

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