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A 1L solution contains 0.2M NH(4)OH and ...

A 1L solution contains 0.2M `NH_(4)OH` and 0.2M `NH_(4)Cl.` If 1.0 mL of 0.001 M HCl is added to it what will be the `[OH^(-)]` of the resulting solution `(K_(b)=2xx10^(-5))`

A

`2xx10^(-5)`

B

`5xx10^(-10)`

C

`2xx10^(-3)`

D

None of these

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