In a blast furnace,iron oxide is reduced by:

The purest form of iron is:

$Aluminium$ oxide is not reduced by chemical reactions since:

Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of sulphur,silicon and phosphorus be removed from cast iron?

In the extraction of copper,metal is formed in the Bessemer converter due to the reaction:

During the metallurgy of aluminium,bauxite is dissolved in cryolite $(Na_3AlF_6)$ because: