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Question

The metal oxide which can react with acid as well as alkali is:

A
silver oxide
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B
copper [II] oxide
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C
aluminium oxide
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D
calcium oxide
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Solution

The correct option is C aluminium oxide
An amphoteric oxide is an oxide that can act either as an acid or base in a reaction.
Al2O3 is an amphoteric oxide. When reacted with HCl, it acts as a base to form the salt AlCl3. When reacted with NaOH, it acts as an acid to form NaAlO2.

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