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Question

BeF2 is formed by decomposition of:

A
BeCl2
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B
(NH4)2BeF4
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C
BeCO3
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D
None of the above
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Solution

The correct option is B (NH4)2BeF4
BeF2 is best prepared by decompostion of (NH4)2BeF4

(NH4)2BeF42NH4F+BeF2

Theory
Reactivity towards halogen:
Group 2 elements combine with halogens at elevated temperature to form their corresponding halides
M+X2MX2
(X= F,Cl ,Br,I)
BeF2 is best formed by the thermal decomposition of (NH4)2BF4
(NH4)2BF42NH4F+BF2
BeO+C+Cl2CO+BeCl2


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