Question

Using Fazans rule, Explain that "AlF3 is high-melting solid while AlCl3 is low melting volatile solid."​

Answer 1

Explanation:

Bigger the size of cation more will be its polarization and covalent character will get induced. Cl- is bigger in size than F- , Hence AlCl3 is more covalent than AlF3 . More covalent character means less melting point.