What material coats the negative cathode in the extraction of Alumumium from pure Aluminium oxide?1 markAluminiumZincGraphiteSilver

The material that coats the negative cathode in the extraction of aluminum from pure aluminum oxide (Al₂O₃) is graphite.

In the Hall-Héroult process, which is the principal method for aluminum extraction, aluminum oxide is dissolved in molten cryolite to lower the melting point and improve conductivity. During the electrolysis process, aluminum ions migrate to the negative cathode, where they gain electrons and are reduced to form aluminum, while at the same time, the graphite cathodes serve as conductive surfaces allowing the flow of electric current. Therefore, the correct answer to your question is Graphite.