Question

$AlC{l}_3$ is convalent while $Al{F}_3$ is ionic. The above fact can be justified on the basis of Fajan's rule.
If true enter 1, else enter 0.

• A. 1

Answer 1

The correct option is A 1
Use Fajan's Rule: It says a covalency is introduced in a bond due to polarization of anion by cation. Factors affecting this polarization are:
1. Cation's size (smaller is the size, more is the polarization.)
2. Anion size (more is the size of anion, more is polarization.)
3. More the charges on cation and anion, more is covalency introduced in bond.
Using these facts, AlCl3 is has more tendency to form covalent bond.