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AP EAMCET201825 Apr 2018Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

The ore which is concentrated by leaching

Options

  1. APbS
  2. BAl 2 O 3 · 2 H 2 O
  3. CSnO 2
  4. DFe 2 O 3

Correct answer

B. Al 2 O 3 · 2 H 2 O

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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