Question

Which of the following is arranged in increasing order of ionic mobility?

• A. $I^{-}<{Br}^{-}<{Cl}^{-}<F^{-}$
• B. $F^{-}<{Cl}^{-}<{Br}^{-}<I^{-}$
• C. $F^{-}<I^{-}<{Cl}^{-}<{Br}^{-}$
• D. $F^{-}<{Cl}^{-}<I^{-}<{Br}^{-}$

Answer 1

The correct option is A $I^{-}<{Br}^{-}<{Cl}^{-}<F^{-}$

Ionic mobility decreases when atomic size increases.
As order of atomic size is $F^{-}<{Cl}^{-}<{Br}^{-}<I^{-}$,
then order of ionic mobility will be $F^{-}>{Cl}^{-}>{Br}^{-}>I^{-}$