Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains
water vapour
oxygen
carbon (IV) oxide
rare gases
Explanation
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I agree also cos when nitrogen a constituent of air is being obtained from air which contains oxygen, carbon dioxide & rare gases also, carbon & oxygen is been removed Leaving nitrogen behind & the rare gases. So the rare gases makes it denser than nitrogen obtained 4rm nitrogen compounds like ammonia etc
The right answer is rare gases because when nitrogen is obtained from air, CO2 and O2 will be removed by passing air through caustic soda and heated copper turnings respectively.
However, the nitrogen obtained this way contains about 1% by volume of rare gases as impurities and is denser than pure nitrogen
Proof:(New school chemistry;Under Nitrogen and its compound, first page)
