(A) According to Fajan's rule,the polarizability of an anion depends on its size. Larger anions are more polarizable because the valence electrons are

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$I^{-} > Br^{-} > Cl^{-} > F^{-}$

(A) According to Fajan's rule,the polarizability of an anion depends on its size. Larger anions are more polarizable because the valence electrons are further from the nucleus and are held less tightly. As we move down the group in the periodic table,the size of the halide ions increases in the order $F^{-} Br^{-} > Cl^{-} > F^{-}$.