(C) The Ellingham diagram is a plot of the standard Gibbs energy of formation $(\Delta G^{\circ})$ versus temperature $(T)$ for the formation of metal

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

(C) The Ellingham diagram is a plot of the standard Gibbs energy of formation $(\Delta G^{\circ})$ versus temperature $(T)$ for the formation of metal oxides.It helps in predicting the feasibility of the reduction of a metal oxide by a given reducing agent.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

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An Ellingham diagram provides information about :

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