Thermodynamics & Ellingham Diagram

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1.
In the Ellingham diagram, the line for formation of most metal oxides has a positive slope because:
2.
The reaction 2C + O2 -> 2CO has a negative slope on the Ellingham diagram because:
3.
Carbon becomes a better reducing agent at high temperatures because:
4.
On the Ellingham diagram, metal A's oxide formation line lies BELOW metal B's line. Which statement is correct?
5.
For a metal oxide reduction to be feasible, the Gibbs free energy change (Delta G) must be:

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