Question

Give name of any two oxides not reduced by common reducing agents.

Answer 1

Aluminium metal has a strong affinity for oxygen and the oxide of $Al$ is $A{l}_2{O}_3$, which is a very stable oxide. Hence ordinary chemically reducing agents are not sufficient to reduce $A{l}_2{O}_3$ to $Al$. Electrolytic reduction is a more powerful reduction method. Similarly sodium oxide, potassium oxide, calcium oxide and magnesium oxides are not reduced by common reducing agents..