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Which of the following reactions is used...

Which of the following reactions is used to make anhydrous beryllium halides ?

A

`2BeO+C CI_(4)overset(800^(@)C)to 2BeCl_(2)+CO_(2)`

B

`BeO+C+CI_(2)overset(700^(@)C)hArr BeCl_(2)+CO`

C

`(NH_(4))_(2)[BeF_(4)]overset(Delta)toBeF_(2)+2NH_(4)F`

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
Anhydrous beryllium halides are best prepared by the best route for the preparation of `BeF_(2)`. The compound itself is made as follows
`BeO+NH_(4)Fto(NH_(4))_(2)[BeF_(4)]`
or `BeO+2NH_(3)+4HFto(NH_(4))_(2)[BeF_(4)]`
Reaction with `C Cl_(4)` is a standard method for making anhydrous chlorides which cannot be obtained by dehydrating hydrates.
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