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JAMB Chemistry 1987 Question 12

Question 12

Air

A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?

  1. A.CO2 and the inert gases
  2. B.N2, CO2 and the inert gases
  3. C.N2 and the inert gases
  4. D.water vapour, N2 and the inert gases.
Show the answer and explanation

Answer: C (N2 and the inert gases)

Explanation

KOH absorbs carbon (IV) oxide, hot copper removes oxygen and fused calcium chloride removes water vapour. Only nitrogen and the inert gases are left.