Read the passage given below and answer the following questions:
The cell constant is usually determined by measuring the resistance of the cell containing a solution whose conductivity is already known. For this purpose, we generally use KCl solutions whose conductivity is known accurately at various concentrations and at different temperatures. Consider the resistance of a conductivity cell filled with 0.1 M KCl solution is 200 Ohm. If the resistance of the same cell when filled with 0.02 M KCl solution is 420 Ohm. (Conductivity of 0.1 M KCl solution is 1.29 S m⁻¹). What is the conductivity of 0.02 M KCl solution?
a. 0.452 S m⁻¹
b. 0.215 S m⁻¹
c. 0.614 S m⁻¹
d. 0.433 S m⁻¹
