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JAMB Chemistry 2002 Question 28

Question 28

Qualitative Analysis

Which of the following gives a precipitate when treated with NaOH solution?

  1. A.AlCl3
  2. B.NH4Cl
  3. C.CH3COONa
  4. D.Na2CO3.
Show the answer and explanation

Answer: A (AlCl3)

Explanation

Al3+ + 3OH− → Al(OH)3, a white gelatinous precipitate. Ammonium chloride gives ammonia gas, and the sodium salts give no precipitate.