Question

Which of the following statement is incorrect regarding Fajan's rule?

• A. It discussed the partial covalent character of ionic bonds
• B. Smaller the size of cation and larger the size of anion, the greater is the covalent character of an ionic bond
• C. Greater the charge on the cation, the greater the covalent character of the ionic bond
• D. For cations of same size and charge, the one with electronic configuration of noble gas is more polarising than the one with transition metals configuration

Answer 1

Answer: (D)

Statement (d) is incorrect. It's correct form is as follows :
For cations of the same size and charge, the one with electronic configuration $(n-1) d^{n} n s^{0}$, typical of transition metals is more polarising than the one with a noble gas configuration, $n s^{2} n p^{6}$.
Rest other statements are correct.