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A buffer solution is prepared by mixing ...

A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 K, the `pK_(b)` of `NH_(4)OH` is 5.0. The pH of buffer is :

A

`10.0`

B

`9.0`

C

`6.0`

D

`8.0`

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