Which of the following oxides is amphoteric in character?

CaO

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CO₂

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SiO₂

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SnO₂

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Solution

The correct option is D
SnO₂

$C a O$ is basic as it form strong base $C a (O H)_{2}$ on reaction with water.

$C a O + H_{2} O \to C a (O H)_{2}$

$C O_{2}$ is acidic as it dissolve in water forming ustable carbonic acid.

$H_{2} O + C O_{2} \to H_{2} C O_{3}$

Silica $(S i O_{2})$ is insoluble in water and acts as a very weak acid.

$S n O_{2}$ is amphoteric as it reacts with both acid and base.

$S n O_{2} + 2 H_{2} S O_{4} \to S n (S O_{4})_{2} + 2 H_{2} O$

$S n O_{2} + 2 K O H \to K_{2} S n O_{3} + H_{2} O$

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