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Delta G^circ' Vs. T plot in the Ellingha...

`Delta G^circ' Vs. T` plot in the Ellingham's diagram slopes downward for the reaction : `Mg+2 O_2 rarr MgO`, `2 Ag+1 / 2 O_2 rarr Ag_2 O`, `C+1 / 2 O_2 rarr CO` , `CO+1 / 2 O_2 rarr CO_2`

A

Mg+2 O_2 rarr MgO

B

2 Ag+1 / 2 O_2 rarr Ag_2 O

C

C+1 / 2 O_2 rarr CO

D

CO+1 / 2 O_2 rarr CO_2

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The correct Answer is:
C
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