Chemistry
During electrolytic reduction of molten alumina, aluminium metal is obtained at
- carbon cathode
- carbon anode
- aluminium anode
- aluminium cathode
Metallurgy
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Answer
carbon cathode
Reason — At cathode :
2Al3+ + 6e- ⟶ 2Al
At anode : 3O2- - 6e- ⟶ 3[O] ⟶ 3O2
Al3+ are discharged in preference to Na1+ and Ca2+ ions due to it's lower position in the electrochemical series.
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