Question

`BeCl_(2).4H_(2)Ooverset(Delta)to "P"`
The product P is
A. `BeCl_(2)`
B. BeO
C. `Be(OH)_(2)`
D. BeOCI

Answer 1

Correct Answer - C
Anhydrous beryllium halides cannot be obtained from materials made in aqueous solution because the hydrated ion `[Be(H_(2)O)_(4)]^(2+)` is formed e.g., `[Be(H_(2)O)_(4)]Cl_(2)` or `[Be(H_(2)O)_(4)]F_(2)`. Attempts to dehydrate result in hydrolysis:
`[Be(H_(2)O)_(4)]Cl_(2)overset(Delta)toBe(OH)_(2)+2HCl`