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KCET2016ChemistryGeneral Principles and Processes of Isolation of Metals

The complex formed when ( Al ₂ O ₃ ) is leached from Bauxite using concentrated ( NaOH ) solution is,

Options

  1. A( N a [A l(O H)₄ ] )
  2. B( NaAl ₂ O ₄ )
  3. C( Na ₂ [ Al ( OH )₃ ] )
  4. D( Na ₂ AlO ₂ )

Correct answer

A. ( N a [A l(O H)₄ ] )

Step-by-step solution

When ( Al ₂ O ₃ ) is leached from bauxite using concentrated ( NaOH ) solution, the complex formed is ( Na [ Al ( OH )₄ ] ) The reaction involved in leaching from bauxite ore is, ( Al ₂ O ₃ 2 H ₂ O +2 NaOH +3 H ₂ O - ^ 473-523 k -> Na [ Al ( OH )₄ ] )

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