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JAMB Chemistry 1979 Question 12

Question 12

Hydrogen, Oxygen and Oxides

Which of the following contains two amphoteric oxides?

  1. A.Sodium oxide, Zinc oxide, Magnesium oxide
  2. B.Aluminium oxide, Calcium oxide, Zinc oxide
  3. C.Potassium oxide, Lithium oxide, Carbondioxide
  4. D.Silver oxide, Lead oxide, Sodium oxide
  5. E.Sulphur dioxide, Aluminium oxide, Carbon monoxide.
Show the answer and explanation

Answer: B (Aluminium oxide, Calcium oxide, Zinc oxide)

Explanation

Aluminium oxide and zinc oxide both react with acids and with alkalis, so they are amphoteric; calcium oxide is basic. Each other set has at most one amphoteric oxide.