Question

Which of the following are added to purified alumina?

पर्याय

• Na₃AlF₆

• CaF₂

• Both Na₃AlF₆ and CaF₂

• Neither Na₃AlF₆ nor CaF₂

Answer 1

Both Na₃AlF₆ and CaF₂

Explanation:

Cryolite (Na₃AlF₆) and fluorspar (CaF₂) are both added to purified alumina to lower its extremely high melting point and enhance its overall electrical conductivity.