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JAMB Chemistry 1989 Question 35

Question 35

Halogens

Bleaching powder, CaOCl2.H2O, deteriorates on exposure to air because

  1. A.it loses its water of crystallization
  2. B.atmospheric nitrogen displaces chlorine from it
  3. C.carbon (IV) oxide of the atmosphere displaces chlorine from it
  4. D.bleaching agents should be stored in solution.
Show the answer and explanation

Answer: C (carbon (IV) oxide of the atmosphere displaces chlorine from it)

Explanation

Carbon (IV) oxide in air reacts with bleaching powder to form calcium carbonate and release chlorine, so the powder slowly loses its available chlorine.