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Q.

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

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a

in the presence of NaCl

b

in the presence of fluorite

c

in the presence of cryolite which forms a melt with higher melting temperature

d

in the presence of cryolite which forms a melt with lower melting temperaure

answer is D.

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Detailed Solution

Addition of cryolite makes the fuse melt at lower melting temperature as well as good conductor of current.
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