1.

The rate constant at `25^(@)C` for the reaction of `NH_(4)^(+)` and `OH^(-)` to form `NH_(4)OH` is `4xx10^(10) M^(-1) sec^(-1)` and ionisation constant of aq. `NH_(3)` is `1.8xx10^(-5)`. The rate constant of proton transfer to `NH_(3)` isA. `1.8xx10^(-5)`B. `7.2xx10^(5)`C. `3.6xx10^(5)`D. `4.2xx10^(-5)`

Answer» Correct Answer - B
`NH_(4)^(+)+OH^(-)overset(k_(1))(to) NH_(4)OH` , `k_(1)=4xx10^(10)`
`NH_(4)OHoverset(K_(f))underset(K_(b))(hArr)NH_(4)^(+)+OH^(-)`
`k_(eq)=(k_(f))/(k_(b))`
`1.8xx10^(-5)=(k_(f))/(4xx10^(10)) implies k_(f)=7.2xx10^(5)`


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