Question

better method for preparation of bef₂ among the following is

• A. \(B e+ F_ 2\,\,\ \underrightarrow{\triangle} \,\,B e F _2\)
• B. \(( N H _4 ) _2 B e F_ 4\,\,\ \underrightarrow{\triangle} \,\,B e F _2\)
• C. \(B eO+C+ F_ 2\,\,\ \underrightarrow{\triangle} \,\,B e F _2\)
• D. \(B eH_2+F_ 2\,\,\ \underrightarrow{\triangle} \,\,B e F _2\)

Answer 1

The Correct Option is B

The better method for preparing BeF\(_2\) involves the decomposition of ammonium beryllium fluoride, \((\text{NH}_4)_2\text{BeF}_4\), by heating it to produce BeF\(_2\) and ammonia fluoride (\(\text{NH}_3\text{F}\)) as by-product. This method is efficient and widely used for preparing beryllium fluoride in laboratory conditions. The reaction is as follows: \[ (\text{NH}_4)_2\text{BeF}_4 \xrightarrow{\Delta} \text{BeF}_2 + 2\text{NH}_3\text{F}. \] Thus, the correct answer is \( \boxed{(2)} \).