Question

An Ellingham diagram provides information about:

• A. The pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.
• B. The conditions of pH and potential under which a species is thermodynamically stable.
• C. The kinetics of the reduction process.
• D. The temperature dependence of the standard Gibbs energies of formation of some metal oxides.

Answer 1

The correct option is D

The temperature dependence of the standard Gibbs energies of formation of some metal oxides.

Explanation for the correct option:

(D)

1. Ellingham diagram is a tool that is extremely used in the field of metallurgy.
2. It gives the diagram of Gibbs free energy versus temperature plot of oxides of metal.
3. Therefore, it used to find the standard Gibbs energies and analyze temperature dependency for formation of some metal oxides.

Explanation for the incorrect options:

(A) Ellingham diagram can't predict the standard electrode potentials and analyze pressure dependence of reduction reactions which involved in the extraction of metals. Hence option (A) is incorrect.

(B) Ellingham diagram doesn't predict the $\mathrm{pH}$ of the reaction. Hence option (B) is incorrect.

(C) Ellingham diagram can't tell about the kinetics of the reaction. Hence option (C) is incorrect.

So option (D) is correct.