12. For a spontaneous electrochemical cell, what must be the correct sign combination for the Gibbs — Electrochemistry Chemistry Question

💡 Solution & Explanation

For any spontaneous process, standard Gibbs free energy change ($\Delta G^\circ$) must be negative. Since $\Delta G^\circ = -nFE^\circ_{cell}$, a negative $\Delta G^\circ$ strictly requires a positive standard cell potential ($E^\circ_{cell} > 0$).