If the $pK_b$ of the fluoride ion $(F^-)$ at $25^{\circ}C$ is $10$,what is the ionization constant $(K_a)$ of hydrofluoric acid $(HF)$ at the same temperature?
- A$1 \times 10^{-5}$
- B$1 \times 10^{-3}$
- C$1 \times 10^{-4}$
- D$1 \times 10^{-2}$
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