Question

Which of the following is an amphoteric hydroxide?

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> NEET 2019

Answer 1

Amphoteric substances are those substances which can react both as acid and as a base.

$Be(OH{)}_2$ is amphoteric in nature since it can react both with acid and base.

$Be(OH{)}_2+2HCl\to BeC{l}_2+2H_{2}O$

$Be(OH{)}_2+2NaOH\to N{a}_2[Be\left(OH{)}_4\right]$

$Mg(OH{)}_2,Ca(OH{)}_2,\text{and}Sr(OH{)}_2$ are basic hydroxides.

Hence, option (b) is correct.