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. [ H+ = 350 S cm 2 mol -1 CH3COO - = 50 S cm 2 mol -1 ]

1. A. 2.50 10 -4 mol L -1
2. B. 1.75 10 -5 mol L -1
3. C. 2.50 10 -5 mol L -1
4. D. 1.75 10 -4 mol L -1

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