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

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Solution

Aluminium metal has a strong affinity for oxygen and the oxide of $A l$ 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 $A l$ . 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..

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