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JAMB Chemistry 1980 Question 3

Question 3

Qualitative Analysis

A solution X on mixing with AgNO3 solution, gives a white precipitate soluble in NH3. A solution Y, when added to X, also gives a white precipitate which is soluble on boiling. Solution Y contains

  1. A.Ag+ion
  2. B.Pb2+ion
  3. C.Pb4+ ion
  4. D.Zn2+ ion
  5. E.Al3+ ion.
Show the answer and explanation

Answer: B (Pb2+ion)

Explanation

The first test shows X contains chloride ions. Lead(II) ions form white lead(II) chloride, which dissolves in hot water, so Y contains Pb2+. Silver chloride would not dissolve on boiling.