The extraction of aluminum is carried out by which of the following processes?

To determine the correct process for extracting aluminum, we must look at the specific metallurgical steps required to move from the raw ore (Bauxite) to the pure metal.A) Hall–Heroult process: Correct. This is the major industrial process for smelting aluminum. Since aluminum is highly reactive, it cannot be reduced by carbon (like iron). Instead, aluminum oxide ($Al_2O_3$) is dissolved in molten cryolite and subjected to electrolysis, which deposits pure aluminum at the cathode.B) Calcination: This is a general metallurgical step where an ore is heated to a high temperature in the absence or limited supply of air to remove volatile impurities or water. While used to prepare alumina from bauxite, it is not the extraction process that yields the metal.C) Leaching: This is a process of treating an ore with a chemical solvent to dissolve the desired metal while leaving the gangue (impurities) behind. For aluminum, the Baeyer Process uses leaching with caustic soda to purify bauxite into alumina, but it does not extract the actual metal.D) Van-Arkel method: This is a refining process used for obtaining ultra-pure metals like Zirconium or Titanium. It involves the formation of a volatile metal iodide which is then decomposed on a hot filament.