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The major role of fluorpar (CaF2 ) which...

The major role of fluorpar (`CaF_2` ) which added in small quantities in the electrolyte reduction of alumina dissolved in fused cryolite `(N_(3)AlF_(6)` ) is

A

to acts as a catalyst

B

to make the fused mixture very conducting.

C

to increase the temperature of the melt.

D

to decrease the rate of oxidation of carbon at the anode

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The correct Answer is:
B
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  11. Froth flotation

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  17. Why lime stone is added in the extraction of lead from galena?

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