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Explain the formation of boron trifluori...

Explain the formation of boron trifluoride.

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(i) Boric acid reacts with calcium fluoride in presence of conc. Sulphuric acid and gives boron trifluoride.
`3CaF_(2)+3H_(2)SO_(4)+2B(OH)_(3)to3CaSO_(4)+2BF_(3)+6H_(2)O`
(ii) Borax when heated witth soda ash it gives borax
`Na_(2)CO_(3)+4B(OH)_(3)to Na_(2)B_(4)O_(7)+CO_(2)+6H_(2)O`
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