During the electrolytic reduction of alumina, the reaction at cathode is

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3F^-→3F+3e⁻

Al³⁺+3e⁻→Al

2H₂O→O₂+4H⁺+4e⁻

2H⁺+2e⁻→H₂

answer is C.

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Detailed Solution

The melting point of alumina is quite high.
Cryolite is introduced during alumina electrolysis to lower the melting point of alumina.
Cryolite also improves alumina conductivity.
Ionic compound aluminium oxide ( $A l_{2} O_{3}$ ) When it is melted, it produces Al³⁺ and O²⁻ ions, which are free to travel and conduct electricity. Ions are not free in the solid state and cannot carry electricity.
Alumina is reduced electrolytically.
Al⁺³+3e^-−→Al.

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