When air which contains the gases Oxygen nitrog... - JAMB Chemistry 2018 Question
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
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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