Among the following compounds, how many are amphoteric in nature?
$B e (O H)_{2}, B e O, B a (O H)_{2}, S r (O H)_{2}$

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Solution

The oxide and hydroxide of Be are amphoteric. Hence, BeO and $B e (O H)_{2}$ are amphoteric. $B a (O H)_{2}$ and $S r (O H)_{2}$ are basic in nature.
Hence, answer is 2.

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