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Assertion : In the metallury of aluminiu...

Assertion : In the metallury of aluminium , purified `Al_(2)O_(3)` is mixed with `Na_(3)AlF_(6)` or `CaF_(2)` .
Reason : `Na_(3)AlF_(6)` or `CaF_(2)` lowers the melting point of mixture and increases its conductivity.

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