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Question

Suggest a condition under which magnesium could reduce alumina.The two equations are:
(a) 43A1+O223A12O3, (b) 2Mg+O22MgO

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Solution

Temperature below the point of intersection of Al2O3 and MgO curves. Magnesium could reduce alumina but the process will be uneconomical. MgO can reduce Al2O3 at any temperature below 1400 °C.

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