Question

Cell reaction is spontaneous, when:

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

Answer 1

Answer: (C)

$\Delta G^o$ is negative

$\Delta G=\Delta H-T\Delta S$
For a spontaneous cell reaction, $\Delta H$ should be negative and $\Delta S$ should be positive.
Hence, $\Delta G$ should be negative.