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

Options

A. `Be(OH)_(2)`
B. `Mg(OH)_(2)`
C. `Ca(OH)_(2)`
D. `Ba(OH)_(2)`

Answer

A

Explanation

The solubility of hydroxides of alkaline earth metals increases from Be to Ba, in water
`Be(OH)_(2)andMg(OH)_(2)` are almost insoluble
Due to high hydration enthalpy and high lattice energy `Be(OH)_(2)` is not soluble in water.
`Be(OH)_(2)` is not soluble in water.
`Be(OH)_(2)` is an amphoteric hydroxide with acids,
`Be(OH)_(2)` is neutralised giving salts.
`Be(OH)_(2)+2HCl toBeCl_(2)+2H_(2)O`
`Be(OH)_(2)` reacts with NaOH also forming beryllate.
`Be(OH)_(2)+2NaOH toNa_(2)BeO_(2)+2H_(2)O`.