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a
The oxidation of CO into CO2 will have a negative slope on Ellingham diagram
b
Reduction of metal oxide is difficult if the metal formed is in liquid state at reduction temperature.
c
The reactive metals have negative slope for oxidation on Ellingham diagram whereas non-reactive metals have a positive slope
d
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