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Q 1410112010.     When `0.1` mol of `CH_3NH_2` (ionisation constant, `K_b = 5 times 10^{-4}`) is mixed with `0.08` mol `HCl` and the volume is made up to `1` L . Find the `[H^+]` of resulting solution

A

`8 times 10^{-2}`

B

`2 times 10^{-11}`

C

`1.23 times 10^{-4}`

D

`8 times 10^{-11}`

HINT

Use formula: `pOH = pK_b + log frac{[sal t]}{[base]}`

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