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JAMB Chemistry 1984 Question 39

Question 39

Nitrogen and its Compounds

Nitrogen can best be obtained from a mixture of oxygen and nitrogen by passing the mixture over

  1. A.potassium hydroxide
  2. B.heated gold
  3. C.heated magnesium
  4. D.heated phosphorus
  5. E.calcium chloride
Show the answer and explanation

Answer: D (heated phosphorus)

Explanation

Heated phosphorus combines with the oxygen and removes it, leaving nitrogen. Heated magnesium would also react with the nitrogen, and gold, KOH and CaCl2 do not remove oxygen.