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JEE Main202228 Jul 2022Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which of the reaction is suitable for concentrating ore by leaching process?

Options

  1. A2 Cu 2   S + 3 O 2 → 2 Cu 2 O + 2 SO 2
  2. BFe 3 O 4 + CO → 3 FeO + CO 2
  3. CAl 2 O 3 + 2 NaOH + 3 H 2 O → 2 Na Al OH 4
  4. DAl 2 O 3 + 6 Mg → 6 MgO + 4 Al

Correct answer

C. Al 2 O 3 + 2 NaOH + 3 H 2 O → 2 Na Al OH 4

Step-by-step solution

Leaching: It involves the treatment of the ore with a suitable reagent as to make it soluble while impurity remains insoluble and after this, the ore is recovered from the solution by suitable methods. The principal ore of aluminium and bauxite usually contain SiO 2 , iron oxides and titanium oxides as impurities. Al 2 O 3   s + 2 NaOH   aq + 3 H 2 O → 2 Na Al OH 4   aq 2 Na Al OH 4   aq + CO 2   g → Al 2 O 3 · xH 2 O   s + 2 NaHCO 3   aq The sodium silicate remai

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