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JAMB Chemistry 1999 Question 11

Question 11

Air

Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains

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

Answer: D (rare gases)

Explanation

Nitrogen from air still contains about 1% of rare gases, mainly argon, which is heavier than nitrogen; this raises its density.