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JAMB Chemistry 2014 Question 38

Question 38

Qualitative Analysis

A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is

  1. A.Zn2+.
  2. B.Pb2+.
  3. C.Ca2+.
  4. D.Al3+.
Show the answer and explanation

Answer: C (Ca2+.)

Explanation

Zn2+, Pb2+ and Al3+ hydroxides are amphoteric and dissolve in excess NaOH; Ca(OH)2 stays as a white precipitate.