Question

state fajan's rules , and give suitable examples.

Answer 1

Answer:

Postulates of Fajans' Rule

• Size of the ion: Smaller the size of cation, the larger the size of the anion, greater is the covalent character of the ionic bond.
• The charge of Cation: Greater the charge of cation, greater is the covalent character of the ionic bond

EXAMPLE :- By Fajans' Rules, compounds are more likely to be ionic if: there is a small positive charge on the cation, the cation is large, and the anion is small. For example, NaCl is correctly predicted to be ionic since Na+ is a larger ion with a low charge and Cl− is a smaller anion.

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Answer 2

Fajans rule is used to tells us that whether a chemical bond is covalent or ionic bond.

Explanation:

• Fajans Rule was given by Kazimeirz Fajan in 1923.
• It depends on the charge on the cation
• it also depends on  the relative size of the anion and cation
• Compound with a low positive charge, large cation and small anion will have an ionic bond
• High positive charge, small cation and large anion will have a covalent bond
• Smaller size cation will have more polarising power
• No compound is 100% ionic nor covalent

Examples are  NaCl is ionic because

• low positive charge, large cation and small anion

Examples are  AlCl₃ is covalent because

• High positive charge, small cation and large anion