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- #General Principles and processes of Isolation Elements
According to the Ellingham diagram, which statement is true?
The higher the standard Gibbs free energy of formation for a metal oxide, the easier it is to reduce the oxide.
The higher the standard Gibbs free energy of formation for a metal oxide, the more difficult it is to reduce the oxide.
The lower the standard Gibbs free energy of formation for a metal oxide, the easier it is to reduce the oxide.
None of these
Answers (1)
According to the Ellingham diagram, which is a graphical representation of the thermodynamic stability of metal oxides, the standard Gibbs free energy of formation (ΔG°) for a metal oxide is plotted on the y-axis.
The Ellingham diagram provides information about the relative stability of metal oxides at different temperatures. A higher value of ΔG° indicates a higher thermodynamic stability for the metal oxide. In other words, it means that the formation of the metal oxide is more favorable.
In the context of reduction, a higher standard Gibbs free energy of formation (higher stability) for a metal oxide implies that it is more difficult to reduce the oxide. This is because the reduction process requires energy to overcome the thermodynamic stability and break the oxide bonds.
Therefore, the statement that the higher the standard Gibbs free energy of formation for a metal oxide, the more difficult it is to reduce the oxide is correct, and it aligns with the information provided by the Ellingham diagram.
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