Which of the following statement is not correct about Ellingham diagram? (a) Δ G increases with a...

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Which of the following statement is not correct about Ellingham diagram?
(a) Δ G increases with an increase in temperature
(b) It consists of plots of Δ_fG^o vs T for formation of oxides
(c) a coupling reaction can be well expressed by this diagram
(d) It express the kinetics of the reduction process

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