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JAMB Chemistry 1993 Question 34

Question 34

Halogens

Which of the following is a property of ionic chlorides?

  1. A.They can be decomposed by heat
  2. B.They react with aqueous AgNO3 to give a white precipitate which is soluble in excess ammonia
  3. C.They explode when in contact with dry ammonia gas
  4. D.They react with concentrated tetraoxosulphate (VI) acid to give white fumes of chlorine gas
Show the answer and explanation

Answer: B (They react with aqueous AgNO3 to give a white precipitate which is soluble in excess ammonia)

Explanation

Chloride ions give a white precipitate of AgCl with silver nitrate, and AgCl dissolves in excess ammonia. This is the standard test for chlorides.