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Answer: (3)
Explanation:
(a) Haematite is another name for hematite. Ferric oxide (Fe2O3), a heavy and relatively hard oxide mineral, is the most important iron resource because of its high iron concentration (70%) and abundance. As a result, haematite is an iron carbonate resource.
(b) Magnetite, often known as iron ore, is a mineral with the chemical formula Fe3O4. It’s one of the iron oxides. It is magnetically attracted to a magnet and can be magnetised to become a permanent magnet.
(c) The most prevalent metal in the earth’s crust is aluminium. Because it is a reactive metal, it does not exist in its free state. Bauxite, Cryolite, and Corundum are examples of aluminium ore.
(d) Siderite, commonly known as chalybite, is a hydrated aluminium oxide with the formula Al2O3.2H2O. It is a common iron mineral and ore with the chemical formula FeO3. This mineral is found in hydrothermal metallic veins and thin layers with shales, clay, or coal seams (as sedimentary deposits) (as gangue, or waste rock).
