In Ellingham diagrams plots of `Delta`G (oxide formation) show positive slopes except for the formation of CO(g) from coke. Why?

Explanation

To answer the question regarding why the Ellingham diagram shows positive slopes for most oxide formations, except for the formation of carbon monoxide (CO) from coke, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Ellingham Diagrams**:
- Ellingham diagrams plot the Gibbs free energy change (ΔG) for the formation of oxides as a function of temperature. A positive slope indicates that the formation of the oxide becomes less favorable as temperature increases.

2. **Formation of Carbon Monoxide from Coke**:
...