Carbon is used to reduce metal oxides when the metal is less reactive than carbon e.g iron
Carbon is a reducing agent- it brings about the reduction of something else(and is itself oxidised)
This occurs in a blast furnace.
The iron that comes out of the blast furnace is -96% Fe and is called cast iron or pig iron. The main impurity is carbon which makes the iron brittle.
When iron is purified it is soft…