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An Ellingham diagram provides information about : (1) the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals. (2) the kinetics of the reduction process. (3) the temperature dependence of the standard Gibbs energies of formation of some metal oxides. (4) the conditions of pH and potential under which a species is thermodynamically stable.

1. the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.
2. the kinetics of the reduction process.
3. the temperature dependence of the standard Gibbs energies of formation of some metal oxides.
4. the conditions of pH and potential under which a species is thermodynamically stable.

Correct answer: the conditions of pH and potential under which a species is thermodynamically stable.

Solution

The correct option highlights that an Ellingham diagram illustrates the stability of metal oxides and their reduction potentials under varying conditions of pH and potential, which are crucial for understanding thermodynamic favorability in metal extraction processes.

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