Conductance of Electrolytic Solutions – Ostwald's Dilution

2021 1 question

1. The molar conductivity of 0.007 M acetic acid is $20\ S\ cm^2\ mol^{-1}$. What is the dissociation constant of acetic acid? Choose the correct option. ($\Lambda^\circ_{H^+}=350\ S\ cm^2mol^{-1}$, $\Lambda^\circ_{CH_3COO^-}=50\ S\ cm^2mol^{-1}$)