Suggest a condition under which magnesium could reduce alumina.The two equations are:
(a) $\frac{4}{3} A 1 + O_{2} \to \frac{2}{3} A 1_{2} O_{3}$ , (b) $2 M g + O_{2} \to 2 M g O$

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Solution

Temperature below the point of intersection of $A l_{2} O_{3}$ and $M g O$ curves. Magnesium could reduce alumina but the process will be uneconomical. $M g O$ can reduce $A l_{2} O_{3}$ at any temperature below 1400 °C.

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