Imperfections in Solids — Prelims Questions

Which of the following defects leads to a decrease in the density of the crystal?

Which of the following compounds exhibits both Frenkel and Schottky defects?

When NaCl crystal is heated in sodium vapor, it acquires a yellow color. This is due to the formation of:

Silicon doped with phosphorus is an example of a/an:

Which of the following statements is INCORRECT regarding metal deficiency defects?

In an ionic solid, if $SrCl_2$ is added as an impurity to NaCl, what type of defect is introduced and what is its consequence?