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Electrolytic reduction of alumina to aluminium by the Hall-Heroult process is carried out : 

(A) in the presence of NaCl 

(B) in the presence of fluorite 

(C) in the presence of cryolite which forms a melt at lower temperature and increases the electrical conductivity 

(D) in the presence of cryolite which forms a melt at higher temperature and increases the electrical conductivity

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(C) in the presence of cryolite which forms a melt at lower temperature and increases the electrical conductivity.

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