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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. ($\Lambda^\circ_{H^+}=350\ S\ cm^2mol^{-1}$, $\Lambda^\circ_{CH_3COO^-}=50\ S\ cm^2mol^{-1}$)
A
$2.50\times10^{-4}\ mol\ L^{-1}$
B
$1.75\times10^{-5}\ mol\ L^{-1}$
C
$2.50\times10^{-5}\ mol\ L^{-1}$
D
$1.75\times10^{-4}\ mol\ L^{-1}$