Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:

  • Option 1)

    Al2O3+HF+NaAlF4

  • Option 2)

    Al2O3+CaF2+NaAlF4

  • Option 3)

    Al2O3+Na3AlF6+CaF2

  • Option 4)

    Al2O3+KF+Na3AlF6

 

Answers (1)

Fluorspar (CaF2) and Cryolite  (Na3•AlF6) lower the melting point of alumina (Al2O3) and make it more conducting which is a lead conductor of electricity and has a high melting point.


Option 1)

Al2O3+HF+NaAlF4

This is incorrect option

Option 2)

Al2O3+CaF2+NaAlF4

This is incorrect option

Option 3)

Al2O3+Na3AlF6+CaF2

This is correct option

Option 4)

Al2O3+KF+Na3AlF6

This is incorrect option

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