Assertion `(A) : ` The ration of specific conductivity to the observed conductance does not depend upon the concentration of the solution taken in the conductivity cell.
Reason `(R) :` Specific conductivity decreases with dilution whereas observed conductance increases with the dilution.

Options

A. If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`.
B. If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.
C. If `(A)` is correct, but `(R)` is incorrect.
D. If `(A)` is incorrect, `(R)` is correct.

Answer

b

Explanation

Both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.
Explanation of `(A):`
Both the terms `k` and `G` are concentration independent term.
`k=GxxG^(**)` and `G=(1)/(R)`
Explanation of `(R):`
`k` decreases with dilution since on dilution number of ions per `mL` decreases but total number of ions increases. Hence, `k` decreases and `G` increases.