Q. The ionic conductance is least for
A) ${Cs}^{+}$
B) ${Rb}^{+}$
C) $K^{+}$
D) ${Na}^{+}$
Explanation
(d)
Due to small size of $Na^{+},$ it is heavily hydrated and become large molecule.
Ionic conductance increases down the group in alkali metals. Order of ionic conductance
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Na^{+} < K^{+} < Rb^{+} < Cs^{+}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.