Fe2O3
Fe3OH4
FeCO3
3Fe2O3 .3H2O
Answer is Wrong!
Answer is Right!
The correct answer is A. Fe2O3.
Magnetite is an iron ore with the chemical formula Fe2O3. It is a black, opaque mineral that is found in igneous and metamorphic rocks. Magnetite is the most magnetic of all the iron ores and is used in the manufacture of magnets, steel, and other iron-based products.
The other options are incorrect. B. Fe3OH4 is the chemical formula for lepidocrocite, a hydrated iron oxide. C. FeCO3 is the chemical formula for siderite, a carbonate mineral. D. 3Fe2O3 .3H2O is the chemical formula for goethite, an iron oxide hydroxide.