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

silver oxide

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copper

[I I]

oxide

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aluminium oxide

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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.
$A l_{2} O_{3}$ is an amphoteric oxide. When reacted with HCl, it acts as a base to form the salt $A l C l_{3}$ . When reacted with NaOH, it acts as an acid to form $N a A l O_{2}$ .

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