If pK(b) for fluoride ion at 25^(@)C is ...

If `pK_(b)` for fluoride ion at `25^(@)C` is `10.83`, the ionisation constant of hydrofluoric acid in water at this temperature is

A

`1.74xx10^(-3)`

B

`3.52xx10^(-3)`

C

`6.75xx10^(-4)`

D

`5.38xx10^(-2)`

Verified by Experts

The correct Answer is:

C

`K_(a)xxK_(b)=K_(omega)`
:. `K_(a)=(K_(omega))/(K_(b))=(10^(-14))/(1.48xx10^(-11))=6.75xx10^(-4)`

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