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NEET2012ChemistryGeneral Principles and Processes of Isolation of MetalsActual

Aluminium is extracted from alumina ( Al ₂ O ₃ ) by electrolysis of a molten mixture of

Options

  1. AAl ₂ O ₃+ HF + NaAlF ₄
  2. BAl ₂ O ₃+ CaF ₂+ NaAlF ₄
  3. CAl ₂ O ₃+ Na ₃ AlF ₆+ CaF ₂
  4. DAl ₂ O ₃+ KF + Na ₃ AlF ₆

Correct answer

C. Al ₂ O ₃+ Na ₃ AlF ₆+ CaF ₂

Step-by-step solution

Alumina, Al ₂ O ₃ , is a bad conductor of electricity and has very high melting point, so before subjecting to electrolysis, it is mixed with fluorspar ( CaF ₂ ) and cryolite ( Na ₃ AlF ₆ ) , which lower its melting point and make it more conducting.

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