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JAMB Chemistry 1981 Question 17

Question 17

Nitrogen and its Compounds

The brown coloration in the nitric acid prepared in the laboratory can be removed by

  1. A.heating the acid
  2. B.bubbling air through the acid
  3. C.cooling the acid
  4. D.adding a decolorizing agent
  5. E.adding a base
Show the answer and explanation

Answer: B (bubbling air through the acid)

Explanation

The brown colour is dissolved nitrogen(IV) oxide. Blowing air through the acid sweeps it out (and oxidises it back to the acid).