Ionic Solids — Prelims Questions

An ionic compound AB has a rock salt type structure. If the radius of the cation $ext{A}^+$ is $100,\text{pm}$ and the radius of the anion $ext{B}^-$ is $200,\text{pm}$, what is the coordination number of $ext{A}^+$?

Which of the following statements about ionic solids is INCORRECT?

Which of the following defects in ionic solids does NOT alter the density of the crystal?

In a crystal of an ionic compound, the $ext{A}^+$ ions are arranged in a face-centered cubic (FCC) lattice, and the $ext{B}^-$ ions occupy all the tetrahedral voids. What is the formula of the ionic compound?

Which of the following ionic compounds is most likely to exhibit a Frenkel defect?

An ionic solid crystallizes in a body-centered cubic (BCC) structure where the cation $ext{M}^+$ occupies the body center and the anion $ext{X}^-$ occupies the corners of the cube. What is the coordination number of $ext{M}^+$ and $ext{X}^-$ respectively?