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JAMB Chemistry 1985 Question 43

Question 43

Metals and their Compounds

Which of the following compounds is NOT the correct product formed when the parent metal is heated in air?

  1. A.Calcium oxide (CaO)
  2. B.Sodium oxide (Na2O)
  3. C.Copper (II) oxide (CuO)
  4. D.Tri-iron tetroxide (Fe3O4)
  5. E.Aluminium oxide (Al2O3).
Show the answer and explanation

Answer: B (Sodium oxide (Na2O))

Explanation

Heated iron forms tri-iron tetroxide, and calcium, copper and aluminium form the oxides listed. Sodium burns in air to give mainly sodium peroxide, Na2O2, not Na2O.