Question

The better reducing agent at $673K$ is:

• A. $CO$
• B. Coke
• C. Both (a) and (b) are eqaul
• D. $Cu$

Answer 1

The correct option is A $CO$

Ellingham diagram represents a graphs between the change in free energy $\left(\Delta G\right)$ and temperature.
Ellingham diagram helps in predicting the feasibility of thermal reduction of ores.
This graph provides basis for considering the choice of reducing agent in reduction of oxides.
At $673K$, the line for $\Delta GvsT$ of $CO-C{O}_2$ lies lower than the $C-CO$ and $C-C{O}_2$.
Hence, CO acts as better reducing agent.