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General Principles And Processes Of Isolation Of Elements

Question

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Suggest a condition under which magnesium could reduce alumina.

Solution

The two equations are:

(a) \frac{4}{3} Al + O_{2} \to 2 {Al}_{2} O_{3} (b) 2 Mg + O_{2} \to 2 MgO

At temperatures at the point of intersection of the Al₂O₃ and MgO curves (marked ‘A’ in diagram), the ΔG° becomes zero for the given reaction.

\frac{2}{3} {Al}_{2} O_{3} + 2 Mg \to 3 MgO + \frac{4}{3} Al

Fig. Gibbs energy (ΔG°) V T plots for formation of some oxides.

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