At $300 \ K$,the conductivity of $0.01 \ mol \ dm^{-3}$ aqueous solution of acetic acid is $19.5 \times 10^{-5} \ S \ cm^{-1}$ and the limiting molar conductivity of acetic acid at the same temperature is $390 \ S \ cm^2 \ mol^{-1}$. The degree of dissociation of acetic acid is:
- A$5.0 \times 10^{-5}$
- B$5.0 \times 10^{-2}$
- C$2.5 \times 10^{-5}$
- D$7.5 \times 10^{-2}$
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