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Which of the following alkaline earth metal hydroxide is amphoteric in nature?

$\begin{array}{1 1}(a)\;Be(OH)_2&(b)\;Ca(OH)_2\\(c)\;Sr(OH)_2&(d)\;Ba(OH)_2\end{array}$

$Be(OH)_2$ is amphoteric because it react both with acids and bases.
Hence (a) is the correct answer.