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JEE Main201815 Apr 2018Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces ' X '. When CO ₂ gas is passed through the aqueous solution of ' X^ , a hydrated compound ' Y ^ ' is precipitated. ' X ' and ' Y ' respectively are.

Options

  1. ANa [ Al ( OH )₄ ] and Al ₂ ( CO ₃ )₃ xH ₂ O
  2. BAl ( OH )₃ and Al ₂ O ₃ xH ₂ O
  3. CNaAlO ₂ and Al ₂ ( CO ₃ )₃ xH ₂ O
  4. DNa [ Al ( OH )₄ ] and Al ₂ O ₃ xH ₂ O

Correct answer

D. Na [ Al ( OH )₄ ] and Al ₂ O ₃ xH ₂ O

Step-by-step solution

Al ₂ O ₃( ~s )+2 NaOH ( aq )+3 H ₂ O (l) Alumina

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