Question

For a spontaneous reaction $\Delta G^o$ and $E^o$ cell will be respectively

• A. $-ve$ and $+ve$
• B. $+ve$ and $-ve$
• C. $+ve$ and $+ve$
• D. $-ve$ and $-ve$

Answer 1

The correct option is A $-ve$ and $+ve$

For a spontaneous reaction, the standard change in Gibbs free energy $\Delta G^0$ and the standard cell potential $E_{cell}^0$ will be negative and positive respectively.

$\Delta G^0<0$
$E_{cell}^0>0$
Note:
$\Delta G^0=-nF{E}_{cell}^0$

Thus, $\Delta G^0$ and $E_{cell}^0$ have opposite signs.