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Explain the significance of Ellingham diagram. |
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Answer» SOLUTION :(1) Ellingham diagram is obtained by plotting standard free energy change `DeltaG^(@)` for the formation of oxides of elements. (2) The oxides of elements which are very stable with high negative values of `DeltaG^(@)` are at the LOWER side of the Ellingham diagram. (3) The positive slope of lines indicate that the stability of metal oxides decreases due to increase in `DeltaG^(@)` with the increase in temperature and they can be reduced easily.  (4) The sudden change in the graphs and slopes indicates a phase change from solid to liquid or from liquid to vapour. (5) (5) The Ellingham diagram enables to select a SUITABLE REDUCING agent for the reduction of given metal oxide. An element can reduce the oxide of another element above it in Ellingham diagram. |
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