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JEE Main202125 Jul 2021Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

Options

  1. ATiO 2
  2. BFe 2 O 3
  3. CZnO
  4. DSiO 2

Correct answer

D. SiO 2

Step-by-step solution

In bauxite impurities of Fe 2 O 3 , TiO 2 and SiO 2 are present, Fe 2 O 3 and TiO 2 are basic oxides therefore does not reacts with or dissolve in NaOH whereas SiO 2 is acidic oxide it gets dissolve in NaOH , hence leach out SiO 2 + 2 NaOH → Na 2 SiO 3 aq . + H 2 O

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