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Isolation of Elements question

2022 · Shift 1 · Q11
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Isolation of Elements question

2022 · Shift 1 · Q11

JEE AdvancedChemistryIsolation of ElementsMultiple correct+4 / −2
The electrochemical extraction of aluminum from bauxite ore involves
  1. A
    the reaction of Al2O3\mathrm{Al}_{2} \mathrm{O}_{3}Al2​O3​ with coke (C)(\mathrm{C})(C) at a temperature >2500∘C\gt 2500^{\circ} \mathrm{C}>2500∘C.
  2. B
    the neutralization of aluminate solution by passing CO2\mathrm{CO}_{2}CO2​ gas to precipitate hydrated alumina (Al2O3⋅3H2O)\left(\mathrm{Al}_{2} \mathrm{O}_{3} \cdot 3 \mathrm{H}_{2} \mathrm{O}\right)(Al2​O3​⋅3H2​O).
  3. C
    the dissolution of Al2O3\mathrm{Al}_{2} \mathrm{O}_{3}Al2​O3​ in hot aqueous NaOH\mathrm{NaOH}NaOH.
  4. D
    the electrolysis of Al2O3\mathrm{Al}_{2} \mathrm{O}_{3}Al2​O3​ mixed with Na3AlF6\mathrm{Na}_{3} \mathrm{AlF}_{6}Na3​AlF6​ to give Al\mathrm{Al}Al and CO2\mathrm{CO}_{2}CO2​.
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