The hydrolysis constant of $0.01 \ M$ methylamine hydrochloride is....... [ Given: $K_b = 5 \times 10^{-4} $ ]
- A$2 \times 10^{-10}$
- B$0.2 \times 10^{-10}$
- C$5 \times 10^{-10}$
- D$5 \times 10^{-11}$
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