Difficult
Cryolite is
- A$Na_{3}AlF_{6}$ and is used in the electrolysis of alumina for decreasing electrical conductivity.
- B$Na_{3}AlF_{6}$ and is used in the electrolysis of alumina for lowering the melting point of alumina only.
- C$Na_{3}AlF_{6}$ and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
- D$Na_{3}AlF_{6}$ and is used in the electrolytic refining of alumina.
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