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JAMB Chemistry 1986 Question 31

Question 31

Halogens

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is

  1. A.HCl
  2. B.HOCl
  3. C.O2
  4. D.Cl2O.
Show the answer and explanation

Answer: C (O2)

Explanation

Chlorine water contains HOCl, which breaks down in sunlight: 2HOCl → 2HCl + O2. The gas given off is oxygen.