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 is

Options

A. `4.008 %`
B. `40.800 %`
C. `2.080 %`
D. `20.800 %`

Answer

A

Explanation

Degree of ionization = `(Lambda_(m))/(Lambda_(m)^(oo)) xx 100 = (9.54 xx 100)/(23.8)`
= 4.008 %