What is the role of cryolite in the metallurgy of aluminium ?

What is the role of renin?

What is the role of graphite in the electrometallurgy of aluminium ?

What is the role of leaching in the extraction of aluminium ? Write all the chemical reactions involved in it.

Define metallurgy.

What is the role of feathers?

What is the role of reproduction?

State the role of silica in the metallurgy of copper.

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