Chemistry - General Principles and Processes of Isolation of Metals Question with Solution | TestHub

$2{\text{Al}}_2{\text{O}}_3\left(\text{s}\right)+3\text{C}\stackrel{12{\text{e}}^{-}}{\to }4\text{Al}\left(\text{s}\right)+3{\text{CO}}_2\left(\text{g}\right)$

$\Delta {\text{G}}^{\circ }=3\Delta {\text{G}}_{\text{f}}^{\circ }\left({\text{CO}}_2\right)-2\Delta {\text{G}}^{\circ }\left({\text{Al}}_2{\text{O}}_3\right)$

$=-3\times 394-2\left(-1520\right)$

$=-1182+3040=+\text{1858 kJ}$

$\Delta {\text{G}}^{\circ }=-{\text{nFE}}^{\circ }$

$1858\times 1000=-12\times 96500\times {\text{E}}^{\circ }$

$\therefore {\text{E}}^{\circ }=-\text{1.60 V}$

Thus, voltage requires$=1.60\; V$