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  4. Which is the coordinating solvent in the following reaction? BF 3+ HF + H 2 O longrightarrow H 3 O ++ BF 4-

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Q. Which is the coordinating solvent in the following reaction?
$BF _{3}+ HF + H _{2} O \longrightarrow H _{3} O ^{+}+ BF _{4}^{-}$

Rajasthan PMTRajasthan PMT 2004

Solution:

$HF$ act as a co-ordinating solvent. It loses proton and $F ^{-}$forms co-ordinate bond with $BF _{3}$.