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The standard electromotive force of the ...

The standard electromotive force of the cell
`Fe|Fe_((aq))^(2+) ||Cd_((aq))^(2+) |Cd`
If the temperature co-officlent of emf `-0.125 VK^(-1)`, the vàlue of `triangleS^(@)" at "25^@C` would be

A

`-20.125 KJ K^(-1)`

B

`-24.125KJ K^(-1)`

C

`26.125KJ K^(-1)`

D

`-22.125KJ K^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`(dE^(@))/(dT)=(triangleS^(@))/(nF)`
`rArr triangleS^(@)=((dE^@)/(dT)) xx nF`
`=-0.125 xx 2 xx 96500`
`=-24.125 xx KJ K^(-1)`
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