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The equivalent conductance of M/32 solut...

The equivalent conductance of M/32 solution of a work monobasic acid is 8 mho `cm^(2)` and at infinite dilution is 400 mho `cm^(2)`. The dissociation constant of this acid is

A

`1.25 xx 10^(-6)`

B

`6.25xx10^(-4)`

C

`1.25xx10^(-4)`

D

`1.25xx10^(-5)`

Text Solution

Verified by Experts

The correct Answer is:
D
`alpha= (Lambda)/(Lambda_(oo))=(8)/(400)=2xx10^(-2)`
Dissociation constant, `K= C alpha^(2)`
`K=(1)/(32)xx(2xx10^(-2))^(2)=1.25xx10^(-5)`
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