For a weak base $BOH$ at $25\,^oC$,the dissociation constant $K_b$ is $1.0 \times 10^{-12}$. The concentration of hydroxyl ions in its $0.01\,M$ aqueous solution will be:
- A$2.0 \times 10^{-6}\,M$
- B$1.0 \times 10^{-5}\,M$
- C$1.0 \times 10^{-6}\,M$
- D$1.0 \times 10^{-7}\,M$
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