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JAMB Chemistry 1983 Question 40

Question 40

Qualitative Analysis

Which of the following solutions will give a white precipitate with barium chloride solution and a green flame test?

  1. A.Na2SO4
  2. B.CuSO4
  3. C.CaSO4
  4. D.CaCl2
  5. E.(NH4)2SO4.
Show the answer and explanation

Answer: B (CuSO4)

Explanation

The white precipitate with BaCl2 shows a sulphate, and copper compounds give a green (blue-green) flame, so it is CuSO4.