Question:

An Ellingham diagram provides information about :

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An Ellingham diagram plots \(\Delta G^\circ\) against T for the formation of oxides.
Updated On: Nov 5, 2026
  • the temperature dependence of the standard Gibbs energies of formation of some metal oxides
  • the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals
  • the conditions of pH and potential under which a species is thermodynamically stable
  • the kinetics of the reduction process
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The Correct Option is A

Solution and Explanation

An Ellingham diagram is a plot of the standard Gibbs energy of formation (\(\Delta_f G^\circ\)) of metal oxides (per mole of \(\mathrm{O_2}\)) against temperature. It is used to judge which reducing agent can reduce a given metal oxide at a given temperature.
It says nothing about kinetics, pressure dependence of electrode potentials, or pH-potential stability (that is a Pourbaix diagram).
Answer: (1) the temperature dependence of the standard Gibbs energies of formation of some metal oxides
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