(a) Aluminium
(b) Copper
(c) Iron
(d) Titanium
Answer: (d)
- Bauxite is a sedimentary rock with a relatively high aluminum content. It is the world’s main source of aluminum and gallium. Bauxite consists mostly of the aluminium minerals gibbsite (Al(OH)3), boehmite (Y-AlO(OH)) and diaspore (α-AlO(OH)), mixed with the two iron oxides goethite (FeO(OH)) and haematite (Fe2O3), the aluminium clay mineral kaolinite (Al2Si2O5(OH)4) and small amounts of anatase (TiO2) and ilmenite (FeTiO3 or FeO.TiO2). B.Main sources of copper are Antimony, Azurite, Bornite, Chalcocite, Chalcopyrite, Chrysocolla, Copper extraction, Copper monosulfide, Copper(I) sulphide, Covellite, Cuprite, Digenite, Dioptase, Malachite, Mineral, Tennantite, Tetrahedrite ores.
C.The iron is usually found in the form of magnetite (Fe3O4, 72.4% Fe), hematite (Fe2O3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe), limonite (FeO(OH)·n(H2O), 55% Fe) or siderite (FeCO3, 48.2% Fe). D. Ilmenite (FeO.TiO2 ) and rutile (TiO2 ) are the two chief minerals of titanium. Along with other heavy minerals are important constituents of beach sand deposits found right from Saurashtra coast (Gujarat) in the west to Digha coast, West Bengal in the east.