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JAMB Chemistry 2001 Question 18

Question 18

Air

What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air?

  1. A.15.00cm3
  2. B.6.30cm3
  3. C.0.63cm3
  4. D.0.06cm3
Show the answer and explanation

Answer: B (6.30cm3)

Explanation

Alkaline pyrogallol absorbs the oxygen, which is about 21% of air: 21% × 30 = 6.30 cm3.