Question 39
Metals and their CompoundsWhich of the following oxide will remain unchanged when heated in hydrogen gas?
- A.Fe2O3
- B.CuO
- C.ZnO
- D.PbO2
Show the answer and explanation
Answer: C (ZnO)
Explanation
Hydrogen reduces oxides of less reactive metals such as iron, copper and lead, but zinc is too reactive, so ZnO is left unchanged.