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JAMB Chemistry 2014 Question 12

Question 12

Air

The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with

  1. A.water vapour.
  2. B.oxygen.
  3. C.rare gases.
  4. D.carbon(IV) oxide.
Show the answer and explanation

Answer: C (rare gases.)

Explanation

Nitrogen from air still contains the rare gases (mainly argon), which are denser than nitrogen, so it is slightly denser than pure nitrogen.