Which of the following is/are amphoteric oxide?

B e O

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B a O

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A l_{2} O_{3}

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C a O

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Solution

The correct options are
A $B e O$
C $A l_{2} O_{3}$
An amphoteric oxide is an oxide that can act as either an acid or base in a reaction.
A) $B e O + H_{2} S O_{4} \to B e S O_{4} + H_{2} O$ .

$B e O + 2 N a O H \to N a_{2} B O_{2} + H_{2} O$ , So amphoteric

B) Barium oxide(BaO) is basic as it reacts with acid to produce salt and water.

$B a O + 2 H C l \to B a C l_{2} H_{2} O$

C) $A l_{2} O_{3} + 6 H^{+} \to 2 A l^{3 +} + 3 H_{2} O$

$A l_{2} O_{3} + 2 O H^{-} + 3 H_{2} O \to 2 A l (O H)_{4}^{-}$ ,So amphoteric.

D) CaO is basic as it reacts with acid to produce salt and water

$C a O + H C l \to C a C l_{2} + H_{2} O$ .

Hence options A & C are correct.

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