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AP EAMCET2003ChemistryGeneral Principles and Processes of Isolation of Metals

During the electrolysis of cryolite, aluminium and fluorine are formed in ........ molar ratio :

Options

  1. A1: 2
  2. B2: 3
  3. C1: 1
  4. D1: 3

Correct answer

B. 2: 3

Step-by-step solution

Electrolysis of cryolite can be explained as Na ₃ AlF ₆ 3 NaF + AlF ₃4 AlF ₃ 4 Al ³⁺+12 ~F ⁻ array cc +12 e⁻ & -12 e⁻ 4 Al & 6 ~F ₂ array (At cathode) (At anode) So, the molar ratio of Al and F ₂ is 4: 6=2: 3 .

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