The most abundant natural Iron Oxides are:

(A) Magnetite and Pyrite
(B) Magnetite and Bauxite
(C) Hematite and Pyrite
(D) Hematite and Magnetite

Q. What is the chemical formula of Hematite?
(A) Fe₂O₃
(B) Fe₃O₄
(C) Fe₂O₄
(D) Fe₃O₂

Q. What is the chemical formula of Magnetite?
(A) Fe₂O₃
(B) Fe₃O₄
(C) Fe₂O₄
(D) Fe₃O₂

Answers:
1. (D) Hematite and Magnetite
2. (A) Fe₂O₃
3. (B) Fe₃O₄