Why carbon is a satisfactory reducing agent for all metal oxides?

or:Why carbon is a satisfactory reducing agent for all metal oxides?or:Ellingham curve for oxidation for reduction of C to CO has negative slope and

or:Why carbon is a satisfactory reducing agent for all metal oxides?

or:Ellingham curve for oxidation for reduction of C to CO has negative slope and thus carbon reduces a number of metal oxides.

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