Question

Ellingham diagram represents

• A. Change of $\Delta G$ with temperature
• B. Change of $\Delta H$ with temperature
• C. Change of $\Delta G$ with pressure
• D. Change of $\Delta G - T\Delta S$ with temperature

Hint:

Ellingham diagrams help predict which metal oxide can be reduced more easily at a given temperature.

Answer 1

The Correct Option is A

Step 1: Recall that an Ellingham diagram is used in metallurgy to study the feasibility of reduction of metal oxides.
Step 2: It is a graphical representation of the variation of Gibbs free energy change ($\Delta G$) with temperature.
Step 3: Since $\Delta G = \Delta H - T\Delta S$, the diagram plots $\Delta G$ on the y-axis against temperature on the x-axis.
Step 4: Therefore, the Ellingham diagram represents the change of $\Delta G$ with temperature.