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In Hail-Heroult's process of extraction ...

In Hail-Heroult's process of extraction of Al, purified `Al_2O_3` is mixed with `Na_3AlF_6` and `CaF_2` in order to

A

decrease conductivity and increase the melting point

B

prevent loss of heat from electrolyte by radiation

C

increase the conductivity and decrease the melting point

D

decrease the fluidity of electrolyte

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