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MHT CET2019Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

In leaching of alumina from bauxite by Bayer’s process, then ore is treated with

Options

  1. AN a O H a q
  2. BN a C N a q
  3. CK C N a q
  4. DN a 2 C O 3 a q

Correct answer

A. N a O H a q

Step-by-step solution

In leaching of alumina from bauxite by Bayer’s process, the ore is treated with NaOH (aq). Concentration is carried out by heating the powdered ore with a concentrated solution of NaOH at 473 - 523 K and 35 – 36 bar pressure. A l 2 O 3 is extracted out as sodium aluminate. A l 2 O 3 s + 2 N a O H a q + 3 H 2 o l → 2 N a A l O H 4 a q The sodium aluminate formed is neutralised by passing C O 2 gas and hydrated A l 2 O 3 is precipitated. 2 N a A l O H 4 a q + C O 2 g → A l 2 O 3 . x H 2 O s + 2 N a H C O 3 a q

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