1.

If dissociation constant of ammonia is `10^(-5)`, its `pK_(b)` and `pK_(4)` value respectively areA. 5 and 9B. 9 and 5C. 7 and 7D. 4 and 10

Answer» Correct Answer - A
`K_(b)` of `NH_(3)` is `10^(-5)` (given)
`:. pK_(b) = 5` and `pK_(a) = 14 - 5 = 9`
Hence, `pK_(b)` and `pK_(a)` values are 5 and 9 respectively.


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