Ionic Solids — Prelims Questions

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

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 $\text{A}^+$ ions are arranged in a face-centered cubic (FCC) lattice, and the $\text{B}^-$ 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 $\text{M}^+$ occupies the body center and the anion $\text{X}^-$ occupies the corners of the cube. What is the coordination number of $\text{M}^+$ and $\text{X}^-$ respectively?