Answer:
From the Ellingham
diagram, we find that 983 K, the curves intersect.
The value of 
G°
for change of C to CO2 is less than the value of G°
for change of CO to CO2. Therefore, coke (C) is a better reducing
agent than CO at 983 K or above temperature. However below this temperature
(e.g., at 673 K), CO is more effective reducing agent than C.
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