Q.
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a
Na3AlF6 and is used in the electrolysis of alumina
b
Na3AlF6 and is used in the electrolytic purification of alumina
c
Na3AlF6 and is used in the electrolysis of alumina for lowering electrical conductivity
d
Na3AlF6 and is used in the electrolysis of alumina for lowering the melting point of alumina
answer is D.
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