What are the limitations of Ellingham diagram?

Explanation

Limitations of Ellingham diagram :
`rarr`Ellingham diagram is based only on the thermodynamic concepts.It does not explain the kinetics of the reduction process. The graph simply indicates whether a reacton is possible or not the kinetics of the reaction.
`rarr`The interpretion of`DeltaG^(@)`is depends on K`[DeltaG^(@)=-RTl.nK]`
it is presumed that reactant and products are in equilirium.
`M_(x)O+A_("red")hArrxM+AO_("ox")`
This is not always true because the reactants or product may be solid.