Question

Cell reaction is spontaneous when

• A. $\Delta G^{o}$ is negative
• B. $ \Delta G^{o} $ is positive
• C. $ \Delta E_{\text{red}}^{o} $ is positive
• D. $ \Delta E_{\text{red}}^{o} $ is negative

Answer 1

Answer: (A)

For spontaneous reaction value of $ \Delta G^{o} $ is always negative.
Note: The free energy change $ (\Delta G) $ of a photochemical reaction may not be negative.