Question

Select the incorrect limitation of Ellingham diagram among the following
The graph simply indicates whether a reaction is possible or not
O It gives idea about kinetics of the reduction process
It is based on thermodynamics concepts
O AH and AS values for any chemical reaction remain nearly constant even on varying temperature.
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Answer 1

Answer:

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Answer 2

The correct answer to this question is (b) It gives the idea about the kinetics of the reduction process

This is because of the following reasons -

1. The Ellingham diagram can be defined as a plot between Δ$_{f}G^o$ and T for the creation of metal oxides. A general reaction expressing oxidation is given with the help of  $2xM(s) + O_2 (g)$ → $2MxO (s)$

2. With the exception of the process within which the change of phase occurs, each plot is a straight line. The temperature at which the change of phase happens is signified by a positive increase in the gradient.

3. The metal oxide is stable at the point situated in a curve under which ΔG is negative. Above the point, the metal oxide is unstable and thus undergoes decomposition on its own.

4. The feasibility of the oxide's reductions of the upper line by the element indicated in the lower line is calculated by the difference between both

Ans) (b) It gives the idea about the kinetics of the reduction process