MetallurgyHard

Question

Carbon cannot be used in the reduction of Al2O3 because :

Options

A.it is non-metal
B.the heat of formation of CO2 is more than that of Al2O3
C.pure carbon is not easily available
D.the heat of formation of Al2O3 is too high

Solution

In Ellingham diagram, the ᐃfGo of Al2O3 lies below that of CO2. If reduction is carried out at very high temperature, the Al produced will react with carbon  forming Al4C3.

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