Question

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

• A. $Be(OH)_{2}$
• B. $Mg(OH)_{2}$
• C. $Ca(OH)_{2}$
• D. $Ba(OH)_{2}$

Answer 1

Answer: (A)

$Be(OH)_{2}$

Answer 2

: Beryllium hydroxide, $Be(OH)_{2}$ is amphoteric in nature, as it reacts with acid and alkali both.

$Be(OH)_{2} + 2HCl \rightarrow BeCl_{2} + 2H_{2}O$

$Be(OH)_{2} + 2NaOH \rightarrow Na_{2}BeO_{2} + 2H_{2}O$