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InterviewSolution
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The mass of carbon anode consumed (givingonly carbon dioxide) in the production of 270 kgof aluminium metal from bauxite by the Hallprocess is (Atmic mass of Al 27)22.Hint : 2Al,0, +3C 4Al+3co2 ][AIPMT 2005](A) 180 kg(C) 540 kg(B) 270 kg(D) 90 kg |
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Answer» Bauxite is not directly used in Hall's process. It is first converted into alumina by Bayer's process.Reaction of carbon withAl2O3forming Aluminium and carbon dioxideis given :2Al2O3+ 3C→4Al + 3CO2 Molar mass of Al = 27 gmol-1Molar mass of Al2O3= 118 g mol-1Molar mass of Carbon = 12 g mol-1 Thus, we can see that according to this reaction, (4×27) = 108 g of Al is formed from the reduction of Al2O3by (3×12) = 36 g of carbon.108 g of Al produced by 36 g of Carbon27000 g of Al is formed by (36 / 108)×27000=90000 g or 90 kg (aaprox.) |
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