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JAMB Chemistry 1998 Question 36

Question 36

Metals and their Compounds

The oxide that remains unchanged when heated in hydrogen is

  1. A.CuO
  2. B.Fe2O3
  3. C.PbO2
  4. D.ZnO
Show the answer and explanation

Answer: D (ZnO)

Explanation

Hydrogen can reduce the oxides of less reactive metals such as copper, lead and iron to the metal. Zinc is too high in the activity series, so heating ZnO in hydrogen leaves it unchanged.