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Question

Study the Ellingham diagram for the formation of some oxides and answer the following question.
At the point of intersection of Al2O3 and MgO curves (A), G0 becomes zero for the reaction,
23Al2O3+2Mg+43Al
Below this point, magnesium can reduce alumina. Although thermodynamically feasible, Al is not used for reduction of MgO because:

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A
temperature required is very high
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B
the yields of metal is very low
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C
the value of G0 becomes positive
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D
magnesium is not used as reducing agent for any reaction
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Solution

The correct option is A temperature required is very high
Temperatures above the point of intersection of Al2O3 and MgO curves, Al can reduce MgO. But the temperature required would be so high that the process will be uneconomic and technology is difficult.

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