Question

At ${25}^{\circ }C$, molar coductance of 0.1 molar aqueous solution of ammonium hydroxide is $9.54$ $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ and at infinite dilution its molar conductance is $238oh{m}^{-1}c{m}^{2}mo{l}^{-1}$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is:

• A. $2.080$%
• B. $20.800$%
• C. $4.008$%
• D. $40.800$%

Answer 1

The correct option is C $4.008$%

Degree of ionization $=\frac{{\lambda }_m}{{\lambda }_m^{\infty }}$

$=\frac{9.54}{238}\times 100=4.008$%