Ncert Exercises & Solutions

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

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

Codes

	A	B	C	D
1.	3	1	4	2
2.	1	2	3	4
3.	1	4	3	2
4.	4	1	3	2

Hint: Frenkel Defect, shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site

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.

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