The correct option is C Iron
Haematite
and magnetite are the ores of iron. Both have iron in different oxidation
states, and they are in the forms of iron oxides. Magnetite is an iron oxide
with the chemical formula Fe3O4. It is a mixture of two iron oxides, FeO and Fe2O3. Haematite is the iron oxide which is formed by Fe (3+) ion. This is a
mineral that can have several colours. It has the molecular formula of Fe3O4.