For the electrolytic refining of aluminium, the three fused layers consist of

Bottom Layer

Middle Layer

Upper Layer

  • A

    Cathode of pure $Al$

    Cryolite and fluorspar

    Anode of $Al$ and $Cu$ alloy

  • B

    Cathode of $Al$ and $Cu$ alloy

    Bauxite and cryolite

    Anode of pure $Al$

  • C

    Anode of $Al$ and $Cu$ alloy

    Cryolite and barium fluoride

    Cathode of pure $Al$

  • D

    Anode of impure $Al$

    Bauxite, cryolite and fluorspar

    Cathode of pure  $Al$

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