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If the equivalent conductance of (M/20) solution of a weak monobasic acid is `25.0 S cm^2 eq^(-1)` and at infinite dilution is `500 Scm^2eq^(-1)`, then the dissociation constant of the acid is

A

`1.25 xx 10^(-3)`

B

`5.55 xx 10^(-4)`

C

`1.25 xx 10^(-4)`

D

`5.55 xx 10^(-5)`

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