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विद्दुत - अपघट्य के `0.1M` सान्द्रता वाले विलयन द्वारा भरी चालकता सैल का प्रतिरोध `100 Omega` है । इस विलयन की चालकता `1.29 S m^(-1)` है । समान सैल को समान विलयन के `0.02 M` से भरने पर प्रतिरोध `520 Omega` पाया गया । विद्दुत - अपघट्य के `0.02M` विलयन की मोलर चालकता होगी -
A. `124xx 10^(-4)S m^(2)mol^(-1)`.
B. `1240xx 10^(-4) S m^(2)mol^(-1)`.
C. `1.24xx10^(-4)S m^(2) mol ^(-1)`
D. `12.4xx10^(-4) S m^(2) mol^(-1)`.

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Correct Answer - A
`k=(1)/(R)xx` सैल स्थिरांक
`therefore` सैल स्थिरांक `=kxxR=1.29xx100=129m^(-1)`
`0.02M` विलयन के लिए ,
`k=(1)/(R)xx` सैल स्थिरांक `=(1)/(520)xx129Sm^(-1)`
सान्द्रण `(c)=0.02molL^(-1)=0.02xx10^(3)mol m^(-3)`
`^^_(m)=(k)/(c)=(129//520(Sm^-1))/(0.02xx10^(3)(mol m^(-3))`
`=124xx10^(-4) S m^(2)mol^(-1)`.

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