The hydroxide of ____is obtained by treating the metal with cold water.

Options

A. Ca
B. Sr
C. Ba
D. all of these

Answer

D

Explanation

The hydroxides of strongly electropositive group 2 elements Ca, Sr, and Ba are obtained either by treating the metal with cold water or by reacting the corresposing oxides with water
`M+2H_(2)OtoM(OH)_(2)+H_(2)`
`MO+H_(2)OtoM(OH)_(2)`
`M=Ca,S and Ba`
`Be(OH)_(2)` and `Mg(OH)_(2)` being isoluble are obtained from water soluble compounds by reaction with alkalies
`MSO_(4)+2NaOHtoM(OH)_(2)+Na_(2)SO_(4)(aq.)`
`M=Be and Mg`