P-Block Elements Ques 529
Question: The role of fluorspar $ (CaF_2) $ which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite $ (Na_3AlF_6) $ is
Options:
A) 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.
Show Answer
Answer:
Correct Answer: B
Solution:
$ CaF_2 $ when added to fused cryolite, lowers the m.p. and increases the conductivity.
