1.

What are the limitations of Ellingham diagram?

Answer»

Solution :The limitations are listed as under :
1. The graph SIMPLY indicates whether a reaction is possible or not because it is based on thermodynamic CONCEPTS. It does not say anything about the kinetics of the reduction process.
2. The interpretation of `triangleG` is based on `K[triangleG= - RT ln K]`. Thus it is presumed that the reactants and products are in equilibrium.
`M_(x)O+A_("red") harr xM+AO_("ox")`
This is not ALWAYS true because the reactant/product may be solid. However, it explains how the reactions are sluggish when every species is in solid state and smooth when the ore melts down.
It is interesting to note here that `triangleH" and "triangleS` values for any rection remain nearly constant even on varying temperatures.


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