Neet Solved Paper 2013 Question 6
Question: At $ 25{}^\circ C $ molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 $ oh{m^{\text{-1}}}c{m^{2}} $ $ mo{l^{\text{-1}}} $ and at infinite dilution its molar conductance is $ 238,oh{m^{\text{-1}}} $ $ c{m^{2}} $ $ mo{l^{\text{-1}}}. $ The degree of ionization of ammonium hydroxide at the same concentration and temperature is
Options:
A) 2.080%
B) 20.800%
C) 4.008%
D) 40.800%
Show Answer
Answer:
Correct Answer: C
Solution:
Given, molar conductance at 0.1 M concentration,
$ {\lambda_c}=9.54{{\Omega }^{-1}}cm^{2}mo{l^{-1}} $ Molar conductance at infinite dilution,
$ \lambda _c^{\infty }=238{{\Omega }^{-1}}cm^{2}mo{l^{-1}} $
We know that, Degree of ionization,
$ \alpha =\frac{\lambda _c^{{}}}{\lambda _c^{\infty }}\times 100 $ $ =\frac{9.54}{238}\times 100=4.008% $
