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The ionization constant of a weak electr...

The ionization constant of a weak electrolyte is `2.5 xx 10^(-5)`, while of the equivalent conductance of its `0.1 M` solution is `19.6 s cm^(2) eq^(-1)`. The equivalent conductance of the electrolyte at infinite dilution is :

A

250

B

196

C

392

D

386

Text Solution

Verified by Experts

The correct Answer is:
C
`K_(a)=Calpha^(2)rArr25xx10^(-6)=10^(-2)xxalpha^(2)`
`alpha=5xx10^(-2)`
`alpha(lamda_(m))/(lamda_(m)^(oo))rArr5xx10^(-2)=(19.6)/(lamda_(m)^(oo))=(19.6xx100)/(8)=392`
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