JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Electrolytic reduction of alumina to aluminium by the Hall-Héroult 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 with lower melting temperatureCorrect
(D)In the presence of cryolite which forms a melt with higher melting temperature

Answer: (C)

Solution

Pure alumina melts at an impractically high temperature (about ); dissolving it in molten cryolite () lowers the melting point of the mixture

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Question ID VK-138583