Question

Aluminium is obtained by the electrolysis of pure $A{l}_2{O}_3$, dissolved in:

• A. alumina
• B. bauxite
• C. cryolite and flourspar
• D. feldspar

Answer 1

Answer: (C)

cryolite and flourspar

Aluminium is obtained by the electrolysis of pure alumina $\left(A{l}_2{O}_3\right)$ dissolved in cryolite $\left(N{a}_{3}Al{F}_6\right)$ and fluorspar $\left(Ca{F}_2\right)$. Cryolite and fluorspar lower the melting point of the mixture and increase electrical conductivity.