Question

The effect of dilution on conductance shows:
A. Increase in conductivity
B. Increase in equivalent conductivity
C. Increase in molar conductivity
D. Decrease in conductance

Answer 1

Hint- In order to solve this question, firstly we will understand the concept of conductance and the effect of dilution on conductance. Then we will compare all the given options to find the required answer.

Complete answer:
Conductance is defined for the number of ions per ml. The SI unit of Conductance is Siemens. Conductivity changes with the concentration of the electrolyte.
On dilution as volume of solution increases. Thus, the number of ions per ml decreases and hence conductivity decreases. Molar conductivity is defined for 1 mole of ions.
Thus on dilution, ions get more apart and mobility of ions increases which leads to increase in molar conductivity of the solution. The rate of drop in the conductance decreases with increased membrane potential.
The instant relationship between sodium or potassium current and membrane potential is usually a straight line with zero current at potential for sodium or potassium. With a drop in concentration variable conductivity decreases.
The effect of Dilution are as follows-
The conductance of solution increases on dilution.
The specific conductivity decreases on dilution.
The equivalent conductivity and molar conductivity increases with dilution.
The equivalent and molar conductivities tend to accumulate maximum value with increasing dilution.
Therefore, we conclude that the effect of dilution on conductance shows increase in equivalent conductivity and molar conductivity.

Hence, option B and C are correct.

Note- While solving this question, we must know that there is a difference between conductance of solution and specific conductivity as one can get confused in this concept. Also, we must know that higher the concentration of ions in solution, the higher will be its conductivity.