25. Which of the following is not true with respect to Ellingham diagram? a) Free energy changes follow a straight line. Deviation occurs when there is a phase change. b) The graph for the formation of CO2 is a straight line almost parallel to free energy axis. c) Negative slope of CO shows that it becomes more stable with increase in temperature. d) Positive slope of metal oxides shows that their stabilities decrease with increase in temperature.
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An Ellingham diagram is a graph showing the temperature dependence of the stability of compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulfides. These diagrams were first constructed by Harold Ellingham in 1944.[1] In metallurgy, the Ellingham diagram is used to predict the equilibrium temperature between a metal, its oxide, and oxygen — and by extension, reactions of a metal with sulfur, nitrogen, and other non-metals. The diagrams are useful in predicting the conditions under which an ore will be reduced to its metal. The analysis is thermodynamic in nature and ignores reaction kinetics. Thus, processes that are predicted to be favourable by the Ellingham diagram can still be slow.
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