Question

The ionic conductance is least for:
A) $C{s^ + }$
B) $R{b^ + }$
C) ${K^ + }$
D) $N{a^ + }$

Answer 1

Hint: We know that ionic conductance is a measure of a substance propensity toward ionic conductivity and it includes the passage of an ion from one location to other defects in solid or aqueous solution's crystal lattice.

Complete answer:
We must remember that due to the small size of sodium ions, it is heavily hydrated and becomes a large molecule ionic conductance increases down the group in alkali metals. The order of ionic conductance is,
$N{a^ + } < {K^ + } < R{b^ + } < C{s^ + }$
Therefore, the option D is correct.
The mechanism in ionic conduction generally occupies fixed positions within the space lattice in solids and doesn't move but ionic conduction can occur specifically because of the temperature rise. In batteries materials that possess ionic conduction property are used. Infinite dilution was an idea found in chemistry that was initially used to study the various solvents, liquids, and solutes, the dissolved substances in solvents. This theory is employed to see solutions properties and to extrapolate or estimate their chemical reactions in various conditions. Infinite dilution is additionally characterized as an answer which contains the most solvent that there's no change in concentration by adding more liquid. This suggests that the properties of the solute-the substance particles and therefore the system won't change, regardless of what proportion of solvent is added to the answer.
Therefore option D is correct.

Note:
Now, we see the molar conductance.
The molar is the amount of concentration is a measure of the concentration of a solute in a solution. Molar conductivity is defined as the conductivity of a one molar aqueous solution placed between one centimeter.