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JAMB Chemistry 2003 Question 35

Question 35

Qualitative Analysis

The salt that will form a precipitate soluble in excess ammonia solution is

  1. A.Ca(NO3)2
  2. B.Cu(NO3)2
  3. C.Mg(NO3)2
  4. D.Al(NO3)3
Show the answer and explanation

Answer: B (Cu(NO3)2)

Explanation

Cu2+ gives a blue Cu(OH)2 precipitate that dissolves in excess ammonia to form a deep blue solution. Al(OH)3 and Mg(OH)2 do not dissolve in excess ammonia.