Question on: JAMB Chemistry - 2018
When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;
A
nitrogen and carbondioxide
B
the rare gases
C
nitrogen and oxygen
D
nitrogen and the rare gases
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Correct Option: D
This is because the quick-lime acts as a drying agent hence, it can dry most gases except ammonia. Consequently, it removes the water vapour. Quick-lime (calcium oxide) reacts with the carbon dioxide forming calcium carbonate. Carbon dioxide and monoxide is eliminated leaving nitrogen, and the rare gases.
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