Question

Ellingham diagram represents the change in

• A. $\Delta G$ with temperature
• B. $\Delta H$ with temperature
• C. $\Delta G$ with pressure
• D. $\Delta S$ with temperature

Answer 1

The correct option is A $\Delta G$ with temperature

Ellingham diagram represents a graphs between the change in free energy $\left(\Delta G\right)$ and temperature.

An Ellingham diagram is a graph showing the temperature dependance of the stability for compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides to metals.
This graph provides basis for considering the choice of reducing agent in reduction of oxides.