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Write down the composition of electrolyt...

Write down the composition of electrolytic mixture used in the extraction of aluminium by electrolytic process. Write the chemical reactions occurring at the electrodes in this process.

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20 parts of pure alumina `(Al_(2)O_(3))`, 60 parts of cryolite `(Na_(3)AlF_(6))` and 20 parts of fluorspar `(CaF_(2))`.
`Al_(2)O_(3)" (molten)"rarr 2Al^(3+)+3O^(2-)`
Cathode (reduction): `2Al^(3+)+6e rarr 2Al, 3O^(2-)-6erarr3O`
Anode (oxidation) : `3O+3Orarr3O+(2)uarr`
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