The correct statement regarding defects in the crystalline solid is

(a) Schottky defects have no effect on the density of crystalline solids

(b) Frenkel defects decreases the density of crystalline solids

(c) Frenkel defcct is a dislocation defect

(d) Frenkel defect is found in halides of alkaline metals

Concept Questions :-

Imperfections in Solids
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The vacant space in bcc lattice cell is ;


(a) 26%

(b) 48%

(c) 23%

(d) 32%

Concept Questions :-

Voids and radius ratio/coordination number
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if a is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be :-

(a) a   (b) a   (c)√3 a   (d)√3 a
    √3          √3            4            2

Concept Questions :-

Introduction and Type of Crystal System
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A metal cryszallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm.
The diameter of the metal atom is
(a) 288 pm
(b) 408 pm
(c) 144 pm
(d) 204 pm

Concept Questions :-

Introduction and Type of Crystal System
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The number of octahedral void(s) per atom present in a cubic close-packed structure is

(a) 1

(b) 3

(c) 2

(d) 4

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Copper crystallises in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?

(a) 128
(b) 157
(c) 181
(d) 108

 

Concept Questions :-

Introduction and Type of Crystal System
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Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be

(a) 240.8 pm

(b) 151.8 pm

(c) 75.5 pm

(d) 300.5 pm

Concept Questions :-

Introduction and Type of Crystal System
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Which of the following statements is not correct?

(a) The fraction of the total volume occupied by the atoms in a primitive cell is 0.48

(b) Molecular solids are generally volatile

(c) The number of carbon atoms in an unit cell of diamond is 4

(d) The number of Bravais lattices in which a crystal can be categorized is 14

Concept Questions :-

Voids and radius ratio/coordination number
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If 'a' stands for the edge length of the cubic systems: simple cubic, body centered cubic and face centered cubic, then the ratio of radii of the spheres in these systems will be respectively,

(a) 12a: 34a:122a     (b) 12a:3a:12a(c) 12a:32a:22a        (d) 1a:3a:2a

Concept Questions :-

Introduction and Type of Crystal System
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Percentage of free space in a body centered cubic unit cell is

(a) 30%                       (b) 32%

(c) 34%                       (d) 28%

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Difficulty Level: