Question

Based on the above Ellingham diagram, the formation of carbon monoxide from carbon can reduce the metal oxide to metal at a temperature _______ the point of intersection of the two lines.
1. Equal to
2. Higher than
3. Lower than
4. None

Answer 1

To occur reaction,
$\Delta G=-ve,T\Delta S>\Delta H$

Since, $\Delta G=\Delta H-T\Delta S$

So, temperature should be higher than the point of intersection of the two lines.