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Question:

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

CsF

NaF

CsI

LiF

Solution:

The order of size of given cations is, Li+ < Na+ < Cs+ and the order of the size of given anions is, I− > F−. Thus, when the cation is large and the anion is smallest, the cation to anion size ratio is maximum. Hence, the cation to anion size ratio is maximum for CsF.