The Ellingham diagram represents a plot of:

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(A) The Ellingham diagram is a graphical representation of the change in Gibbs free energy $(\Delta G)$ of formation of oxides,sulfides,and halides of

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$\Delta G$ v/s $T$

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(A) The Ellingham diagram is a graphical representation of the change in Gibbs free energy $(\Delta G)$ of formation of oxides,sulfides,and halides of elements as a function of temperature $(T)$.It is essentially a plot of $\Delta G$ versus $T$ for the oxidation or reduction reactions of metals.This diagram helps in predicting the feasibility of thermal reduction of metal oxides.

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