Assertion : Molar conductivity increases with decrease in concentration. Reason:Conductivity always decreases with decrease in concentration.

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. A is correct but R is wrong
D. If both (A) and (R) are incorrect.

Answer

B

Explanation

`lambda_(m)=kV` With decrease in concentration, total volume V of the solution containing one mole of electrolyte also increases and decrease in k (conductivity) on dilution of a solution is more than compensated by increase in its volume, hence molar conductivity `(lambda_(m))` increases.