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JAMB Chemistry 1985 Question 16

Question 16

Nitrogen and its Compounds

In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO2 and O2 from air, and sample 2 is prepared by passing purified nitrogen (i) oxide over heated copper? Sample 1 is

  1. A.purer than sample 2
  2. B.slightly denser than sample 2
  3. C.in all respects the same as sample 2
  4. D.colourless but sample 2 has a light brown colour
  5. E.slightly less reactive than sample 2.
Show the answer and explanation

Answer: B (slightly denser than sample 2)

Explanation

Nitrogen from air still contains about 1% of the noble gases, mainly argon, which is heavier than nitrogen. So it is slightly denser than pure nitrogen made chemically.