Question

Specific conductivity of a solution-
A. increase with dilution
B. Decreases with dilution
C. Remains unchanged with dilution
D. Depends on the mass of the electrolyte.

Answer 1

For the given question, we should know about the specific conductivity of a solution at a given dilution is the conductance of $1\,c{m^3}$ of the solution. It is represented by kappa (k). It is the measurement of the ability of the material to conduct electricity.

Complete Step By Step Answer:
We know that conductivity of a material is that property which allows the flow of ions through itself and hence it conducts electricity. In other words, it is defined as the reciprocal of resistance of that material. The SI unit of conductance is Siemens (s).
Also, the reciprocal of resistivity is called specific conductivity.
We should know about the specific resistance which is defined as the resistance offered by the unit length and unit cross section of the substances to a current when the voltage is applied to it.
$k = \dfrac{1}{\rho }$
Where, $k$is specific conductance and $\rho$is specific conductance.
In the given question, the specific conductivity of a solution depends upon dilution. It decreases with dilution. This is due to the reason because the specific conductivity depends upon the number of ions per unit volume. With dilution, the number of ions per unit volume decreases which results in the decrease in specific conductivity.
Therefore, the correct answer is option (B) i.e. decreases with dilution.

Note:
The specific conductivity of the solution depends on the molar concentration or dilution of the solution. It should be remembered that specific conductivity depends upon the number of ions per unit volume. Also, the number of ions per unit volume decreases with dilution.