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The oxidation of CO into CO2 will have a negative slope on Ellingham diagram

Reduction of metal oxide is difficult if the metal formed is in liquid state at reduction temperature.

The reactive metals have negative slope for oxidation on Ellingham diagram whereas non-reactive metals have a positive slope

Reduction of metal oxide is normally less feasible at high temperature.

answer is C.

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Detailed Solution

(1) The oxidation of CO into CO2 will have a straight line almost parallel to temperature axis.(2) Reduction of a metal oxide is easier if the metal formed is in liquid state at reduction temperature because the entropy is higher if the metal is in a liquid state.(4) Reduction of metal oxide is normally not possible at high temperature because ∆G=0

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