The expression connecting $E_{\text{cell }}^{\circ }$ and $K_{\mathrm{eq}}^{\circ }$ of the reaction occurring in a galvanic cell is

The expression connecting $E_{\text{cell }}^{\circ }$ and $K_{\mathrm{eq}}^{\circ }$ of the reaction occurring in a galvanic cell is $\ln K_{\text{eq }}^{\circ }=nF{E}_{\text{cell }}^{\circ }/RT$.

A galvanic cell or voltaic cell is an electrochemical device that transforms the chemical energy of spontaneous redox reactions into electrical energy. electrical cell A voltaic cell is an electrochemical device that produces electricity through chemical processes.

Hence, correct option is C.