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Question

Which of the following oxides doesn't react with both of an acid and alkali ?

A
ZnO
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B
SnO2
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C
Al2O3
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D
MgO
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Solution

The correct option is C MgO
Explanation:
Zinc oxide ZnO, Tin(IV) oxide or SnO2, Aluminum oxide Al2O3 are all amphoteric substances, meaning they can react with both acids and bases.

But in MgO, Magnesium is a metal and like most of the metals, it forms basic oxides. It is a basic oxide and contains oxide ions.
Hence it will not react with both acid and alkali.

Option D is correct.

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