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  4. Assertion: Magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Reason: MgO curve lies above Al2O3 curve in Ellingham diagram.

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Q. Assertion : Magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium.
Reason : $MgO$ curve lies above $Al_2O_3$ curve in Ellingham diagram.

General Principles and Processes of Isolation of Elements

Solution:

The curve for $MgO$ lies below $Al_2O_3$ in Ellingham diagram for an appreciable range of temperature and in that temperature range magnesium can reduce $Al_2O_3$, but this process is uneconomical hence, it is not used to reduce alumina,