$S b F_{6}, A s F_{5}$ and $B F_{3}$ accept $F^{-} f r o m H F$ as :

$A s F_{5} + H F ⇌ H^{+} + [A s F_{6}]^{-}$
$B F_{3} + H F ⇌ H^{+} + [B F_{4}]^{-}$

Identify nature of HF and fluorides.

Fluorides are behaving as base.

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HF is behaving as acid.

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Fluorides are behaving as acid.

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HF is behaving as base.

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None of the above

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Solution

The correct options are
C HF is behaving as base.
D Fluorides are behaving as acid.
$S b F_{5}, A s F_{5}, B F_{3}$ etc. are $F^{-}$ acceptors thus they are behaving as an acid and HF behaves as a base :
$S b F_{5} a c i d + H F b a s e \to [S b F_{6}]^{-} + H^{+}$

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