The $pH$ of a $0.1 \ M$ solution of the acid $HQ$ is $3$. The value of the ionization constant,$K_a$ of the acid is:
- A$3 \times 10^{-1}$
- B$1 \times 10^{-3}$
- C$1 \times 10^{-5}$
- D$1 \times 10^{-7}$
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