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At $25^\circ C$ molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 $ohm^{-1}cm^2mol^{-1}$ and at infinite dilution its molar conductance is 238 $ohm^{-1}cm^2mol^{-1}$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is:
A
40.800%
B
2.080%
C
20.800%
D
4.008%
Detailed Solution
$\%\alpha = \frac{\Lambda_m^c}{\Lambda_m^\infty}\times100 = \frac{9.54}{238}\times100 = 4.008\%$