MCQ
Assertion $(A):$ For strong electrolytes, there is a slow increase in molar conductivity with dilution and can be represented by the equation $\Lambda_m^0=\Lambda_m-A c^{1 / 2}$
Reason $(R):$ The value of the constant $'A \ '$ for $\ce{NaCl, CaCl_2,}$ and $\ce{MgSO_4}$ in a given solvent and at a given temperature is different.
  • A
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
  • Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.

Answer

Correct option: B.
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
$\Lambda_m^{\circ}=\Lambda_m-A c^{1 / 2}$ is an incorrect equation, the correct equation is $\Lambda_m=\Lambda_m^0-A c^{1 / 2}$

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