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Manipal Entrance Test 2016 Chemistry Paper
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© examsnet.com
Question : 48
Total: 50
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
in the presence of
NaCl
in the presence of Hnorite
in the presence of cryolite which forms a melt with lower melting temperature
in the presence of cryolite which forms a melt with higher melting temperature
Validate
Solution:
In the metallurgy of alumina, purified
Al
2
O
3
is mixed with
Na
3
AlF
6
or
CaF
2
. which lowers the melting point of the mix and brings conductivity.
2
Al
2
O
3
+
3
C
→
4
Al
+
3
CO
2
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