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deltaG^(o) vs T plot in the Ellingham's ...

`deltaG^(o)` vs T plot in the Ellingham's diagram slopes downaward for the reaction.

A

Mg + `1/2 O_2 rArr` MgO

B

2Ag + `1/2 O_2 rArr Ag_(2)O`

C

`C+1/2O_(2)toCO`

D

`CO+1/2O_(2)toCO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
For the reaction C + `1/2 O_2` `rarr` CO , the `deltaS` increase. Therefore, T`deltaS` increases with temperature. Hence `deltaG(deltaH - TdeltaS)` decreases. It means the slope of the curve for formation of CO decreases. However, for all other oxides, it increases.
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