P-Block Elements Ques 35
Question: In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
[KCET 2004]
Options:
A) Minimize the heat loss due to radiation
B) Protect aluminium produced from oxygen
C) Dissolve bauxite and render it conductor of electricity
D) Lower the melting point of bauxite
Show Answer
Answer:
Correct Answer: C
Solution:
In electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to charge because it reduces the melting point of Bauxite (from $ 1200^{o}C $ to $ 800^{o}-900^{o}C $ ) and also it increases electrical conductivity of mixture.
