Question

The following question is relevant to the extraction of Aluminium:

Along with cryolite and alumina, another substance is added to the electrolyte mixture. the substance is ___________.

• A. Fluorspar
• B. Mica
• C. NaCl
• D. None of these

Answer 1

The correct option is A Fluorspar

Fluorspar is the substance act as a solvent and it increases conductivity. (Pure alumina melts at about ${2000}^{o}C$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at ${900}^{o}C$ and $A{l}_2{O}_3$ becomes a good conductor of electricity.)