Acidic character of liquid \( \mathrm{HF} \) increases on addition ...

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Acidic character of liquid \( \mathrm{HF} \) increases on addition of which of the following compound ?
(a) \( \mathrm{SiF}_{4} \)
(b) \( \mathrm{SF}_{6} \)
(c) \( \mathrm{BF}_{3} \)
(d) (a) and (c) both
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