Question

The correct order of decreasing polarizability of ion is _____.

• A. > > >
• B. > > >
• C. > > >
• D. > > >

Answer 1

The correct option is C

> > >

From Fajan Rule, bigger the anion, more is the polarizability.

From periodic table, atomic size increases down the group.

$\therefore$ Size of given anions are in the order $r_{I^{-}}$ > $r_{{Br}^{-}}$ > $r_{{Cl}^{-}}$ > $r_{F^{-}}$

Thus , $I^{-}$ is most polarized followed by ${Br}^{-}$ , ${Cl}^{-}$ and $F^{-}$

$\therefore$ The order of polarizability is $I^{-}$ > ${Br}^{-}$ > ${Cl}^{-}$ > $F^{-}$