JAMB - Chemistry (2018 - No. 28)
If one of the following oxides is heated with hydrogen or carbon using a bunsen burner. it is not reduced to the metal, Which one is it?
lead oxide
Magnesium oxide
Copper oxide
Tin oxide
Explication
The oxides of Potassium, Sodium, Calcium, and Magnesium are not reduced when they react with carbon and hydrogen.