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Solution-
b)cryolite Na3AlF6 is used as a solvent for aluminium oxide in the Hall-Heroultprocess, used in the refining of aluminium.. The chemical is used in molten state as
b)cryolite Na3AlF6 is used as a solvent for aluminium oxide in the Hall-Heroultprocess, used in the refining of aluminium.. The chemical is used in molten state as
Al2O3 + 4AlF63- →3Al2OF62- + 6F-
C)
at cathode- Al3+ + 3e- → Al
C)
at cathode- Al3+ + 3e- → Al
At anode- 3O2- → 3O2