Physical Chemistry
Suggest a condition under which magnesium could reduce alumina?
6 Answers
Gaurav
Temperatures below the point of intersection of Al2O3and MgO curves, magnesium can reduce alumina. But the process will be uneconomical.
MagO can reduce Al2O3 at any tempeerature below 1400 0C
MagO can reduce Al2O3 at any tempeerature below 1400 0C
Priya
1. The reaction: 3 Mg + Al2O3 → 2 Al + 3 MgO2. On studying the Ellingham diagram we see that point of intersection, below which ∆G for the above reaction is negative is above 2000 K.3. Thus, this reaction is feasible at a very high temperature.
Gomati
4/3Al+O2->2/3Al2O3 and 2Mg+O2->2MgO
At the point of intersection of Al2O3 and MgO curves , the ∆G becomes zero for the reaction 2/3Al2O3+2Mg->2MgO+4/3Al . Below that point magnesium can reduce alumina.
Gomati
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Gaurav jaiswal
in ncert the answer is given wrong.
magnesium can reduce alumina below the point of the intersection .
But, magnesium is not used in metallurgy of aluminium because magnesium is costlier than aluminium .
Dr Haseena
Mg reduces al when Gibbs free energy change of MgO formation is more negative than alumina formation.
This is below the point of intersection
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