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JAMB Chemistry 2011 Question 33

Question 33

Qualitative Analysis

A few drops of concentrated HNO3 is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be

  1. A.Pb2+
  2. B.Cu2+
  3. C.Fe3+
  4. D.Fe2+
Show the answer and explanation

Answer: D (Fe2+)

Explanation

Concentrated HNO3 oxidises pale-green Fe2+ to Fe3+, giving a yellow-brown solution.