The molar conductivities of $\mathrm{KCl}, \mathrm{NaCl}$ and $\mathrm{KNO}_3$ are 100,120 and $90 \mathrm{~cm}^2 \mathrm{~mol}^{-1}$, respectively. The molar conductivity of $\mathrm{NaNO}_3$ would be .......... cm $\mathrm{mol}^{-1}$.

• Correct answer
  A

  110
• B

  290
• C

  310
• D

  120

Solution

molar conductivity $\Lambda_{\mathrm{m}}^{\circ}$ According to Kohlrausch law,

Hence, the correct answer is option: 'A'.