An Ellingham diagram provides information about : (A) the kinetics of the reduction process. (B) the conditions of pH and potential under which a species is thermodynamically stable. (C) the pressure

Question

An Ellingham diagram provides information about :

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

Prashant Kotian · Accepted Answer

Correct answer: D. Ellingham diagram is graph of Gº vs T of any metal / element oxide. Since Gº = Hº – TSº for most metal oxide formation metal (s) + oxygen (g)  metal oxide (s) Hº = – ve Sº = – ve so graph will be a straight line with – ve y- intracept & +ve slope.

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