Which of the following has the highest cation to anion size ratio?

Question

Which of the following has the highest cation to anion size ratio? (A) CsI (B)  CsF (C) LiF (D)  LiI

Tardigrade Admin · Accepted Answer

The cation to anion size ratio will be maximum when the cation is of largest size and the anion is of smallest size. Among the given species, Cs+ has maximum size among given cations and F- has smallest size among given anions, thus CsF has highest rc/ra ratio

Q. Which of the following has the highest cation to anion size ratio?

$C s I$

$C s F$

$L i F$

$L i I$

The cation to anion size ratio will be maximum when the cation is of largest size and the anion is of smallest size. Among the given species, $C s^{+}$ has maximum size among given cations and $F^{-}$ has smallest size among given anions, thus $C s F$ has highest $r_{c} / r_{a}$ ratio