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Explain the extraction of aluminium from...

Explain the extraction of aluminium from purified alumina by Hall-Heroult process.

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At cathode : `Al^(3+)+3e^(-)rarr Al`
At anode : `C+O^(2-)rarrCO+2e^(-)` or
`C+2O^(2-)rarrCO_(2)+4e^(-)`
Overall reaction is `2Al_(2)O_(3)+3Crarr 4Al+3CO_(2)`
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Knowledge Check

  • The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by Hall process is:

    A
    180 kg
    B
    270 kg
    C
    540 kg
    D
    90 kg

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