The molar ionic conductivities of `NH_(4)^(+) annd OH^(-)` at infinite dilution are 72 and 198 `ohm^(-1)cm^(2)`, respectively, the molar conductivity of a centinormal `NH_(4)OH` solution aththe same temperature is found to be 9 `ohm^(-1)cm^(2)`. The percentage dissociation of `NH_(4)OH` at this concentration will beA. `33%`B. `7.14 %`C. `12.5%`D. `4.54 %`

The molar ionic conductivities of `NH_(4)^(+) annd OH^(-)` at infinite

1.	The molar ionic conductivities of `NH_(4)^(+) annd OH^(-)` at infinite dilution are 72 and 198 `ohm^(-1)cm^(2)`, respectively, the molar conductivity of a centinormal `NH_(4)OH` solution aththe same temperature is found to be 9 `ohm^(-1)cm^(2)`. The percentage dissociation of `NH_(4)OH` at this concentration will beA. `33%`B. `7.14 %`C. `12.5%`D. `4.54 %`
Answer» Correct Answer - C `Lambda^(@) (NH_(4)OH) = lambda_(NH_(4)^(+))^(@) + lambda_(OH^(-))^(@)` `= 72 + 198 = 270 ohm^(-1) cm(2)` `alpha = Lambda//Lambda^(@) = 9//270 = 1//30 = 0.0333` `% alpha = 3.33 %`

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