The equivalent conductance of M 32 solution of a weak monobasic acid is 8.0 mho cm 2 and at infinite dilution is 400 mho cm 2 , The dissociation constant of this acid is -

1. A. 1.25 10 -4
2. B. 1.25 10 -5
3. C. 1.25 10 -6
4. D. 6.25 10 -4

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