1.

`pK_(a)` of `NH_(4)^(+)` is 9.26. Hence, effective range for `NH_(4)OH-NH_(4)Cl` buffer is about pH:A. 8 .26 to 10 .26B. 4.74 to 5.74C. 3.74 to 5.74D. 8.26 to 9.26

Answer» Correct Answer - A
`pK_(a)+pK_(b)=pK_(w)`
`pOH=pK_(b)pm1`
`pH=14-pOH`


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