Q. Among the following which one has the highest cation to anion size ratio?
A) CsI
B) CsF
C) LiF
D) NaF
Explanation
[Solution from source] The ratio is largest when the cation is largest and the anion smallest: Cs⁺ is the biggest cation and F⁻ the smallest anion, so CsF (about 167/133 ≈ 1.26). CsI has a big cation but a much bigger anion, and LiF has the smallest cation. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.