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Cryolite is...

Cryolite is

A

`Na_(3)AlF_(6)` and is used in the electrolysis of alumina for lowering the melting point of alumina only

B

`N_(3)AlF_(6)` and is used in the elctrolytic refining of alumina

C

`Na_(3)AlF_(6)` and is used in the electrolysis of alumina for decreasing electrical conductivity

D

`Na_(3)AlF_(6)` and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina .

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The correct Answer is:
B
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