A 2 l solution was prepared by mixing of...

A `2 l` solution was prepared by mixing of `NH_(3)` and `(NH_(4))_(2)SO_(4)`.If `pH` of solution was found `8` and solution contains one mole of `NH_(3)` then moles of `(NH_(4))_(2)SO_(4)` was taken will be `[pk_(b)` of `NH_(3)=5]`
(A)`2`
(B)`4`
(C)`5`
(D)`1`

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