# Which of the following statements are correct?

(1) Frenkel defect is usually favoured by a very small difference in sizes of cation and anion

(2) Frenkel defect is a dislocation defect

(3) Trapping of an electron in the lattice leads to formation of F-Center

(4) Schottky defects have no effect on physical properties of solids

$\begin{array}{1 1} (1)\;and\;(2) \\ (2)\;and\;(3) \\ (3)\;and\;(4) \\ (2)\;and\;(4) \end{array}$

Answer: (2) and (3) are correct.
(2) Frenkel defect is a dislocation defect. In a Frenkel defect the ion instead of the expected location is found in one of the interstices.
(3) Trapping of an electron in the lattice leads to formation of F-Center. Schottky defect involves the absence of cation or anion from the position it is expected to occupy. This affects the physical properties of solids.