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Q.

Select the correct statement

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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
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