question_answer 114)

    Match the defects given in Column I with the statements in given Column II.

	Column 1	Column 11
A.   B.   C.   D.	Simple vacancy   defect Simple   interstitial defect   Frenkel defect Schottky defect	1. Shown by non-ionic solids and increases density of the solid 2. Shown by ionic solids and decreases density of the solid 3. Shown by non-ionic solids and density of the solid decreases 4. Shown by ionic solids and density of the solid remains the same

Answer:

                        A. ® (3)   B.® W    C.® (4)   D. ®(2) A. When some of lattice sites are vacant in any non-ionic solid, the crystal is said to have vacancy defect and due to decrease in number of particles present in crystal lattice the density of crystal decreases. B. Simple interstitial defect are shown by non- ionic solids in which constituent particles is displaced from its normal site to an interstitial site. Hence, density of solid increases. C. Frenkel defect is shown by ionic solids in which smaller ions get dislocated from its normal site to its interstitial site which lead to decrease its density. D. Schottky defect is shown by ionic solids in which equal number of cation and anion get missed from ionic solids and thus, density of solid decreases.