Questions
Electrolytic reduction of Alumina to Aluminium by Hall-Heroult process is carried out _____?
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By Expert Faculty of Sri Chaitanya
a
In presence of NaCl
b
In presence of CaF2
c
In the presence of cryolite which forms a melt with lower melting temperature
d
In the presence of cryolite which forms a melt with higher melting temperature.
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Correct option is C
The purpose of adding cryolite is to lower the melting point and also to increase conductivity as it furnishes more no. ions.
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