Why pure alumina cannot be electrolysed for the extraction of aluminium metal?

The best electrolyte for the extraction of magnesium metal is

What are the common methods used in the extraction of metals?

What is the significance of leaching in the extraction of aluminium ?

What is the significance of leaching in the extraction of aluminium?

Which of the following reagent is used in the extraction of Aluminium form bauxite ?

Blast furnace is used in the extraction of the metal

What is meant by extraction of metals?

Although thermodynamically feasible, in practice , magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium .Why?