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InterviewSolution
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How will you extract aluminum from its ore? |
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Answer» Solution :The extraction of aluminum from bauxite involves two steps: (1) Conversion of bauxite into alumina - Baeyer.s Process The conversion of bauxite into alumina involves the following steps: Bauxite ore is finely ground and heated under pressure with a solution of concentrated caustic soda solution at150 ° C to obtain sodium meta aluminate.On diluting sodium meta aluminate with water, a precipitate of aluminum hydroxide is formed The precipitate is filtered, washed, dried and ignited at `1000^(@)C` to get alumina. `2Al(OH)underset(Delta)overset(1000^(@)C)toAl_(2)O_(3) + 3H_(2)O` (ii) Electrolytic reduction of alumina - Hall.s Process Aluminum is produced by the electrolytic electrolytic process of manufacturing aluminum reduction of fused alumina`(Al_(2),O_(3))` in the electrolytic cell.Cathode: Iron tank linked with graphite Anode: A bunch of graphite rods suspended in molten electrolyte. Electrolyte: PURE alumina + molten CRYOLITE carbon cathode lining + fluorspar (fluorspar lowers the fusion TEMPERATURE of electrolyte) Temperature: 900 - 950 ° C Voltage used: 5-6 V Overall reaction: `2 Al_(2)O_(3)rightarrow4Al+3O_(2)uparrow`Aluminum is DEPOSITED at the cathode and oxygen gas is liberated at the anode.Oxygen combines with graphite to form `CO_(2)` 
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