Question

Which of the following hydroxide is amphoteric in nature?

• A. $Ca(OH{)}_2$
• B. $Ba(OH{)}_2$
• C. $Sr(OH{)}_2$
• D. $Be(OH{)}_2$

Answer 1

The correct option is D $Be(OH{)}_2$

$Be(OH{)}_2$ is amphoteric in nature whereas $Ba(OH{)}_2$, $Sr(OH{)}_2$ and $Ca(OH{)}_2$ are basic in nature. The amphoteric nature of Be is due to its smaller size and high ionisation energy.
$Be(OH{)}_2$ react with both acid as well base.
$Be(OH{)}_2+2O{H}^{-}\to [Be(OH{)}_4{]}^{2-}$
$Be(OH{)}_2+2HCl+2H_{2}O\to [Be\left(O{H}_2{)}_4\right]C{l}_2$