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NEET2014ChemistryGeneral Principles and Processes of Isolation of MetalsActual

When CO ₂ is passed through solution of sodium aluminate, precipitate of which compound is formed?

Options

  1. AAl ( OH )₃
  2. BAl ₂ O ₃
  3. CNa ₂ CO ₃
  4. DNo ppt.

Correct answer

A. Al ( OH )₃

Step-by-step solution

(a) : In Hall's process, for purifying the bauxite ore, the solution containing sodium meta aluminate is warmed to 50-60^ C and carbon dioxide is circulated through it, Al ( OH )₃ separates out as precipitate. 2 NaAlO ₂+ CO ₂+3 H ₂ O 2 Al ( OH )₃+ Na ₂ CO ₃

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