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JAMB Chemistry 1993 Question 35

Question 35

Acids, Bases and Salts

When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed. The products of this reaction are

  1. A.PbO(s) + Br−(aq) + KNO3
  2. B.Br2 + NO2(g) + PbBr2(s)
  3. C.PbO(s) + K+(aq) + Br−(aq) + NO2(g)
  4. D.PbBr2(s) + K+(aq) + NO3−(aq)
Show the answer and explanation

Answer: D (PbBr2(s) + K+(aq) + NO3−(aq))

Explanation

This is a double decomposition: Pb2+ and Br− form insoluble PbBr2, while K+ and NO3− stay in solution as spectator ions.