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AP EAMCET201823 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 is a process in which powdered ore is treated with certain reagents, which dissolves the ore leaving behind impurities in undissolved form. Aluminium ore is concentrated by this method, bauxite ( Al ₂ O ₃ 2 H ₂ O ) contain ferric oxide, titanium oxide and silica as impurities. Bauxite is treated with aqueous solution of caustic soda. Alumina get dissolved forming soluble sodium aluminate leaving behind impurities. Al ₂ O ₃+6 NaOH 2 Na ₃ AlO ₃+3 H ₂ O

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