(a)
The important ores of iron are haematite $(Fe_{2}O_{3})$, magnetite $(Fe_{3}O_{4})$ and iron pyrites $(FeS_{2})$ . Iron is manufactured from haematite ore.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.