Point Defects — Prelims Questions

Which of the following statements is INCORRECT regarding point defects in solids?

An ionic solid $AB$ has $Na^+$ and $Cl^-$ like structure. If the radius of $A^+$ is $100,\text{pm}$ and that of $B^-$ is $200,\text{pm}$, which type of stoichiometric defect is most likely to be observed?

Which of the following defects would lead to an increase in the electrical conductivity of an intrinsic semiconductor like silicon?

When ZnO is heated, it turns yellow and becomes a semiconductor. This phenomenon is due to which type of point defect?

In a crystal of $Fe_{0.93}O$, what is the percentage of $Fe^{3+}$ ions in the crystal?

Which of the following defects is responsible for the yellow color of NaCl crystals when heated in an atmosphere of sodium vapor?