Q.

Δ G0  vs  T plot in the Ellingham’s diagram slopes downward for the reaction

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a

Mg+12O2→MgO

b

2Ag12O2→Ag2O

c

C+12O2→CO

d

CO+12O2→CO2

answer is C.

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Detailed Solution

Curves in the Ellingham diagrams for the formation of metallic oxides are basically straight lines with a positive slope The formation free energy of carbon dioxide (CO2) is almost independent of temperature, while that of carbon monoxide (CO) has negative slope and crosses the CO2 line near 700 °
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