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JAMB Chemistry 1991 Question 16

Question 16

Environmental Pollution

Which of the following ions is a pollutant in drinking water even in trace amounts?

  1. A.Ca2+
  2. B.Hg2+
  3. C.Mg2+
  4. D.Fe2+
Show the answer and explanation

Answer: B (Hg2+)

Explanation

Mercury(II) ions are poisonous even in tiny amounts. Calcium, magnesium and small amounts of iron ions are harmless.