The Ore of Aluminium is (1) Hematite (2) Magnetite (3) Bauxite (4) Siderite

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).