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Amphoteric hydroxides react with both al...

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)`

Text Solution

Verified by Experts

The correct Answer is:
A
The solubility of hydroxides of alkaline earth metals increases from Be to Ba, in water. `Be(OH)_(2)` and `Mg(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 an amphoteric hydroxide. With acids, `Be(OH)_(2)` is neutralised giving salts.
`Be(OH)_(2) +2HCI rarr BeCI_(2) +2H_(2)O`
`Be(OH)_(2)` reacts with `NaOH` also forming beryllate
`Be(OH)_(2)+2NaOH rarr Na_(2)BeO_(2)+2H_(2)O`
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