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At 25∘C, the molar conductance of 0.007M...

At 25∘C, the molar conductance of 0.007M hydrofluoric acid is 150 mho cm2 mol−1  and Λ∘m=500 mho cm2 mol−1. The value of the dissociation constant of the acid at the gas concentration at 25∘C is

A

7×10−4M

B

7×10−5M

C

9×10−3M

D

9×10−4M

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