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JAMB Chemistry 2004 Question 32

Question 32

Halogens

Which of the following gases can be collected by the method of downward delivery?

  1. A.chlorine
  2. B.oxygen
  3. C.ammonia
  4. D.hydrogen
Show the answer and explanation

Answer: A (chlorine)

Explanation

Downward delivery suits gases denser than air. Chlorine is about 2.5 times as dense as air; ammonia and hydrogen are lighter, and oxygen is collected over water.