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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 + 1/2 O_2 to MgO`

B

`2 Ag + 1/2 O_2 to Ag_2O`

C

`C + 1/2 O_2 to CO`

D

`CO + 1/2 O_2 to CO_2`

Text Solution

Verified by Experts

The correct Answer is:
C
`C(s) + 1/2 O_(2(g)) to CO_((g)), DeltaS` increases.
Hence, as the temperature increases, `TDeltaS` increases and hence `DeltaG (DeltaH-TDeltaS)` decreases. In other words, the slope of the curve for formation of CO decreases. However, for all other oxides, it increases.
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