Q. The molar conductivities of KCl, NaCl and $KNO_{3}$ are 152, 128 and 111 S ${cm}^{2}{mol}^{- 1}$ respectively. What is the molar conductivity of $NaNO_{3}$ ?

A) 101 S ${cm}^{2}{mol}^{- 1}$
B) 87 S ${cm}^{2}{mol}^{- 1}$
C) -101 S ${cm}^{2}{mol}^{- 1}$
D) -391 S ${cm}^{2}{mol}^{- 1}$
Explanation

(b)
$NaCl\ + \ {KNO}_{3}\ \longrightarrow \ {NaNO}_{3} + \ KCl\$
$KCl\ –\ NaCl$
Molar conductivities 152 128
Difference $= \ 24\ S\ {cm}^{2}\ {mol}^{- 1}$
Molar conductivities of ${KNO}_{3}$ = 111
Molar conductivities of ${NaNO}_{3}$ = 111 – 24
$= \ 87\ S\ {cm}^{2}\ {mol}^{- 1}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

Want more practice?
Practice Electrochemistry MCQs