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Amphoteric Oxides of Metals

The element t...

Question

The element that combines with oxygen to give an amphoteric oxide is:

A

N

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B

P

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C

A l

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D

N a

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Solution

The correct option is C $A l$
Reactions:
With acid:
$A l_{2} O_{3} + 6 H C l ⟶ 2 A l C l_{3} + H_{2} O$

With alkali:
$A l_{2} O_{3} + 2 N a O H ⟶ 2 N a A l O_{2} + H_{2} O$
$A l$ combines with oxygen to give amphoteric oxides

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