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AP EAMCET2005ChemistryGeneral Principles and Processes of Isolation of Metals

Observe the following statements regarding purification of bauxite I. During Hall's process, silica is removed as Si (vapour). II. Bauxite ore contaminated with Fe ₂ O ₃ is purified in Baeyer's process. III. During Serpeck's process, AlN is formed. The correct answer is

Options

  1. AI, II and III are correct
  2. BOnly I and II are correct
  3. COnly I and III are correct
  4. DOnly II and III are correct

Correct answer

D. Only II and III are correct

Step-by-step solution

Red bauxite which contains Fe ₂ O ₃ as the main impurity, is refined either by Baeyer's process or by Hall's process. White bauxite containing SiO ₂ impurity is refined by Serpeck's method. In Serpeck's method, following reactions take place. gathered Al ₂ O ₃ 2 H ₂ O +3 C + N ₂ 1800^ C 2 AlN +3 CO +2 H ₂ O AlN +3 H ₂ O Al ( OH )₃+ NH ₃ 2 Al ( OH )₃ Al ₂ O ₃+3 H ₂ O gathered

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