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