At `25^(@)C` molar conductance of `0.1` molar aqueous solution of ammonium hydroxide is `9.54 ohm^(-1) cm^(2) mol^(-1)` and at infinte dilution its molar conductance is `238 ohm^(-1) cm^(2) mol^(-1)` The degree of ionisation of ammonium hydroxide at the same concentration and termperature isA. `20.800%`B. `4.008%`C. `40.800%`D. `2.080%`

At `25^(@)C` molar conductance of `0.1` molar aqueous solution of ammo

1.	At `25^(@)C` molar conductance of `0.1` molar aqueous solution of ammonium hydroxide is `9.54 ohm^(-1) cm^(2) mol^(-1)` and at infinte dilution its molar conductance is `238 ohm^(-1) cm^(2) mol^(-1)` The degree of ionisation of ammonium hydroxide at the same concentration and termperature isA. `20.800%`B. `4.008%`C. `40.800%`D. `2.080%`
Answer» Correct Answer - B The degree of ionisation `(alpha)` of ammonium hydrox-ide at the same temperature and concentration is given as follows: `alpha=(Lambda_(m)^(c))/(Lambda_(m)^(oo))` `= (9.54 ohm^(-1)cm^(2)mol^(-1))/(238 ohm^(-1)cm^(2)mol^(-1))` `= 0.04008` Therefore, percentage ionisation will be `= 0.04008 xx 100% = 4.008%`

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