NEETChemistryElectrochemistry
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The cell constant of a conductivity cell changes when the concentration of the electrolyte solution filled in it is changed. Reason (R): Cell constant is equal to the product of conductivity and resistance of the solution. In the light of the above statements, choose the most appropriate answer fro
Options
- ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
- BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
- CAssertion (A) is true but Reason (R) is false
- DAssertion (A) is false but Reason (R) is true
Correct answer
D. Assertion (A) is false but Reason (R) is true
Step-by-step solution
The cell constant ( G^* ) of a conductivity cell is defined as the ratio of the distance between the electrodes ( l ) to their area of cross-section ( a ). It depends only on the physical dimensions of the cell ( G^* = l a ) and remains constant even if the concentration or nature of the electrolyte solution is changed. Thus, Assertion (A) is false. The mathematical relationship between cell constant, conductivity ( ), and resistance ( R ) is given by G^* = R . Thus, Reason (R) is true. Therefore, Assertion (A) is