In which of the following is impurity defect observed?

$A$ solid solution of $CdCl_2$ and $AgCl$ exhibits which type of defect?

The incorrect statement about the imperfections in solids is .... .

Electron-deficient impurities are caused by the elements of which group?

Use the appropriate symbols $T$ (True) or $F$ (False) for the following statements regarding defects in solids:
$(1)$ Frenkel defect arises due to the arrangement of cations and anions with a very small difference in size.
$(2)$ Frenkel defect can be called a dislocation defect.
$(3)$ $F$-centers arise due to the migration of electrons released from metal atoms into the crystal lattice.
$(4)$ Physical properties of the crystal do not change due to Schottky defect.

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