The correct option is A Al_2O_3 An amphoteric compound is a molecule or ion that can react #10;both as an acid as well as a base. Many metals (such as c ...

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Introduction to p Block Elements

Amphoteric ox...

Question

Amphoteric oxide is:

A l_{2} O_{3}

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S i O_{2}

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P_{4} O_{10}

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C l O_{7}

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Solution

The correct option is A $A l_{2} O_{3}$
An amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides.
In acid: ${A l}_{2} O_{3} + 6 H C l ⟶ 2 A l {C l}_{3} + 3 H_{2} O$
In base: ${A l}_{2} O_{3} + 2 N a O H + 3 H_{2} O ⟶ 2 N a [A l {(O H)}_{4}]$
Hence, ${A l}_{2} O_{3}$ is an amphoteric oxide.

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