Question

Application of fajans rule

Answer 1

Explanation:

• Fajan's rule.

1. It tells about (percentage) of covalent character in ionic bond.
2. It tells about melting and boiling point.
3. It tells about solubility

• Note:

1. Polarisation of anion leads to birth of covalent character in ionic bond

• Applications

• For cation=>

1. Size of cation is indirectly proportional to covalent character
2. Size of cation is indirectly proportional to Polarising power
3. Charge of cation leads to covalent character also leads to small size but charge is directly proportional to Polarising power

• For Anion=>

1. Size of anion is indirectly proportional to covalent character
2. Size of cation is indirectly proportional to Polarising power
3. Charge of anion is indirectly proportional to Size of anion

• Remember that=>

1. Pseudo inert gas configuration [ns1, np6, nd10] is more covalent than any other .
2. Also they have High Polarising power that any other.

• Note

1. Covalent character indirectly proportional solubility
2. Covalent character indirectly proportional to Melting and boiling point
3. Covalent character is directly proportional colour imparting nature

Hope it helps you..........