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a
Na3AlF6 and is used in the electrolysis of alumina for decreasing electrical conductivity.
b
Na3AlF6 and is used in the electrolysis of alumina for lowering the melting point of alumina.
c
Na3AlF6 and is used in the electrolytic purification of alumina.
d
Na3AlF6 and is used in the electrolysis of alumina for increasing the melting point and electrical conductivity.
answer is B.
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Detailed Solution
Cryolite is Na3AlF6 and is used in the electrolysis of alumina. It reduces to melting point of alumina and increase the electrical conductivity of electrolyte.