Among the following which has the highest cation to anion size ratio ?

Options

A. CsI
B. CsF
C. LiF
D. NaF

Answer

B

Explanation

The order of size of given cation is `Li^(+)ltNa^(+)ltCs^(+)` and the order of the size of given anion is `I^(-)gtF^(-)`. When the cation is largest and anion is smallest the cation to anion size ratio is maximum. Thus CsF will have the maximum ratio.