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Cell reactiomn is spontaneous whenA. `E_("red")^(@)` is negativeB. `E_("red")^(@)` is positiveC. `DeltaG^(@)` is negativeD. `DeltaG^(@)` is positive

Answer» Correct Answer - C
If the standard emf of the cell is `E` and `nF` is the amount of charge passed and `Delta_(r)G^(@)` is the standard Gibbs energy of the reaction, then
`Delta_(r)G^(@) = -nFE_("cell")^(@)`
For a reaction to be spontaneous, `Delta_(r)G^(@)` should be negative while `E_("cell")^(@)` should be positive.


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