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Which acid can combine with its own salt again?

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a

$HF$

b

$HBr$

c

$HCl$

d

$HI$

answer is A.

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Detailed Solution

HF is the only acid that can combine with its own salt again. It is unique in forming acids as difluoride ions as $F$ from $H$ -bond with $HF$ .
If two molecules of HF come in contact of each other, the hydrogen of one molecule will attract the fluorine of another $HF$ molecule by electrostatic force of attraction.

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