1.

How is boron trifluoride obtained from boron trioxide ?

Answer»

Solution :(i) BORON trifuloride is obtained by the TREATMENT of calcium fluoride with boron trioxide in presence of conc. Sulphuric acid.
`B_(2)O_(3)+3CaF_(2)+3H_(2)SO_(4)OVERSET(Delta)to 2BH_(3)+3CaSO_(4)+3H_(2)O`
(ii) It can also be obtained by treating boron trioxide with carbon and fluorine.
`B_(2)O_(3)+3C+3F_(2)to 2BF_(3)+3CO`
(iii) In the laboratory pure `BF_(3)` is prepared by the thermal decomposition of benzene DIAZONIUM tetrafluoro borate.
`PhN_(2)BF_(4)overset(Delta)to BF_(3)+PhF+N_(2)`


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