Study the Ellingham diagram for the formation of some oxides and answer the following question.
At the point of intersection of $A l_{2} O_{3}$ and $M g O$ curves (A), $△ G^{0}$ becomes zero for the reaction,

$\frac{2}{3} A l_{2} O_{3} + 2 M g \to + \frac{4}{3} A l$

Below this point, magnesium can reduce alumina. Although thermodynamically feasible, Al is not used for reduction of $M g O$ because:

Question

Study the Ellingham diagram for the formation of some oxides and answer the following question.
At the point of intersection of

A l_{2} O_{3}

and

M g O

curves (A),

△ G^{0}

becomes zero for the reaction,

\frac{2}{3} A l_{2} O_{3} + 2 M g \to + \frac{4}{3} A l

Below this point, magnesium can reduce alumina. Although thermodynamically feasible, Al is not used for reduction of

M g O

because:

Filo · Accepted Answer

Temperatures above the point of intersection of Al2​O3​ 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.

Question Text	Study the Ellingham diagram for the formation of some oxides and answer the following question. At the point of intersection of $A l_{2} O_{3}$ and $M g O$ curves (A), $△ G^{0}$ becomes zero for the reaction, $\frac{2}{3} A l_{2} O_{3} + 2 M g \to + \frac{4}{3} A l$ Below this point, magnesium can reduce alumina. Although thermodynamically feasible, Al is not used for reduction of $M g O$ because:
Answer Type	Text solution:1
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