From the Ellingham graphs on carbon , which of the following statements is false ?

Options

A. `CO_(2)` is more stable than `CO` at less than 983 K
B. CO reduces `Fe_(2) O_(3)` to Fe at less than 983 K
C. CO is less stable than `CO_(2)` at more than 983 K
D. CO reduces `Fe_(2) O_(3)` to Fe in the reduction zone of Blast furnace

Answer

C

Explanation

Below 983 K , `Delta G^(@)` for the formation of `CO_(2)` is more negative than `DeltaG^(@)` for the formation of CO , so `CO_(2)` is more stable . At temperature above 983 K , `Delta_("formation")^(@)` of CO is more negative than `Delta G_("formation")^(@)` of `CO_(2)` , so CO is more stable . So statement (c) is false .
`Delta G_("formation")^(@)` of `CO_2` from `CO` is more negative than
`Delta G_("formation")^(@)` of `Fe_(2) O_(3)` . This means that `Fe_(2) O_3` can be reduced by CO below 1073 K .