Halides (`Cl^('),Br^(')"and"I^(')`) if alkaline earth metal (s) which cannot be dehydrated by heating is (are)

Options

A. `Ca^(2+)`
B. `Mg^(2+)`
C. `Ba^(2+)`
D. `Be^(2+)`

Answer

B,D

Explanation

Halides of `Be^(2+)` and `Mg^(2+)` cannot be dehydrated by heating because of hydrolysis e.g.,
`MgCl_2.8H_2Ooverset(Delta)toMg(OH)_2+2HCluparrow+6H_2Ouparrow`