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JAMB Chemistry 1980 Question 24

Question 24

Air

Air is passed through the apparatus shown (alkaline pyrogallol, then a U-tube of CaCl2) and gas X comes out. In the above experiment X is

Diagram for this question
  1. A.pure nitrogen
  2. B.a mixture of nitrogen and oxygen
  3. C.a mixture of nitrogen and carbondioxide
  4. D.a mixture of oxygen and inert gases
  5. E.a mixture of nitrogen and inert gases
Show the answer and explanation

Answer: E (a mixture of nitrogen and inert gases)

Explanation

Alkaline pyrogallol absorbs oxygen and carbon dioxide, and calcium chloride removes water vapour. What is left is nitrogen together with the noble (inert) gases.