Question

State and explain fajan's rule

Answer 1

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Here is your answer

» For a given cation, covalent character Increases with increase in size of the anion

» For a given anion, covalent character increases with a decrease in the size of the cation

» Covalent character Increseas with increasing charge either on cation or an anion

» Covalent character is higher for compounds with cations with pseudo noble gas electronic configuration

Answer 2

The statement and explanation of Fajan's rule are:

• The statement of Fajan's Rule is based on the three properties and they are-

1. Electronic configuration:- The cations having the same size and charge that are found in the transition elements show more covalent character than the cation found in alkali elements.
2. Size of the ion- If the size of the cation is small, then the size of the anion is large and there is an increase in the covalent character of the electrovalent bond.
3. The charge of Cation- If the charge of the cation is greater, then there is an increase in the covalent character of the electrovalent bond.

• The explanation of the Fajan's Rule is given in three cases or rules and they are-

1. The first case or the first rule tells about the cation's polarising power.
2. The second case or the second rule reveals the anion's polarizability.
3. The third case or the special case is explained by considering an example to find out the more covalent compounds between HgCl₂ and calcium chloride and we cannot determine by using the factor size as the Ca²⁺ and Hg²⁺ are almost of the same size.