$pH$ of $0.05 \ M$ aqueous solution of diethyl amine is $10$. The value of equilibrium constant $(K_b)$ is:
- A$4 \times 10^{-7}$
- B$2 \times 10^{-7}$
- C$2 \times 10^{-3}$
- D$4 \times 10^{-3}$
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