Which of the following metallic oxides cannot be reduced by normal reducing agents?

Magnesium oxide

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Copper(II) oxide

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Zinc oxide

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Iron(III) oxide

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Solution

The correct option is A Magnesium oxide
Magnesium metal is an alkaline earth metal. The tendency of these metals is to lose electron. They lose electron and form oxide. Now, they are stable hence it is very difficult for them to again gain that electron. Hence, they are not reduced by normal reducing agents.

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