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KCET2024ChemistryGeneral Principles and Processes of Isolation of Metals

The incorrect statement about Hall -Heroult process is

Options

  1. Acarbon anode is oxidised to CO and CO ₂ .
  2. BNa ₃ AlF ₆ helps to decrease the melting point of the electrolyte.
  3. CCaF ₂ helps to increase the conductivity of the electrolyte.
  4. Doxidation state of oxygen changes in the overall cell reaction.

Correct answer

D. oxidation state of oxygen changes in the overall cell reaction.

Step-by-step solution

The incorrect statement about Hall-Heroult process is given in option (d). It is because in this process oxidation state of oxygen remains same in the overall cell reaction. 2 Al ₂ O ₃+3 C 4 Al +3 CO ₂

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