With dilution,the conductivity of a solution $—$

Which among the following concentrations of $KCl$ solution is not used to determine the cell constant of a conductivity cell?

What is the $SI$ unit of conductivity?

The specific conductance (conductivity) of a solution is $0.2 \ \Omega^{-1} cm^{-1}$ and its conductance is $0.04 \ \Omega^{-1}$. The cell constant would be .............. $cm^{-1}$.

An increase in molar conductance of a strong electrolyte with dilution is mainly due to

Conductivity (unit $S$) is directly proportional to the area of the vessel $(A)$ and the concentration of the solution $(C)$ in it,and is inversely proportional to the length of the vessel $(l)$. The unit of the constant of proportionality is: