Question

Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?

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

Answer 1

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

Solution:

$Be(OH{)}_2$ is amphoteric and can react with both acid and base.
Beryllium hydroxide reacts with sodium hydroxide to form a beryllate ion and thus becomes soluble in it.

The reaction is given as-

$Be(OH{)}_2+2O{H}^{-}\to [Be(OH{)}_4{]}^{2-}$

Hence the correct answer is option (A).