Q. In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
A) Minimise 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
Explanation
(d)
Cryolite $(Na_{3}AlF_{6})$ is added to alumina for its electrolysis to decrease its melting point and also increase its conductivity.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.