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Assertion (A) : In weak electrolytes, the change in $Λ_{m}$ with dilution is mainly due to increase in degree of dissociation
Reason (R) : At a given concentration of weak electrolyte the degree of dissociation $α = \frac{{Λ^{0}}_{m}}{Λ_{m}}$

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Both A and R are true and R is the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

answer is D.

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Detailed Solution

According to Ostwald’s dilution law upon dilution the degree of ionisation of weak electrolyte increases. As no. of ions increases, $Λ_{m}$ also increase
According to kohlrausch law $\frac{Λ_{m}}{Λ_{m}^{0}}$ in degree of dissosiation

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