For a relation \[ \Delta_{\mathrm{r}} \mathrm{G}=-\mathrm{nFE} \text { cell } \] \( \mathrm{E}_{...

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For a relation
\[
\Delta_{\mathrm{r}} \mathrm{G}=-\mathrm{nFE} \text { cell }
\]
\( \mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\circ} \) in which of the following condition?
(a) Concentration of any one of the reacting species should be unity
(b) Concentration of all the product species should be unity.
(c) Concentration of all the reacting species should be unity.
(d) Concentration of all reacting and product species should be unity.
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