The ionic radii of A+ and B- ions are 0.98 x 10-10 m and 1.81 x10-10 m.  The coordination

number of each ion in AB is.

1. 4

2. 8

3. 2

4. 6

 

Subtopic:  Voids, Radius Ratio & Coordination Number | Density & Packing Fraction |
 60%
NEET - 2016
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The correct statement regarding defects in the crystalline solid is

1. Schottky defects have no effect on the density of crystalline solids

2. Frenkel defects decreases the density of crystalline solids

3. Frenkel defcct is a dislocation defect

4. Frenkel defect is found in halides of alkaline metals

Subtopic:  Imperfections in Solids & Semiconductors |
 78%
From NCERT
NEET - 2015
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The vacant space in bcc lattice cell is ;

1. 26%

2. 48%

3. 23%

4. 32%

Subtopic:  Voids, Radius Ratio & Coordination Number |
 82%
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NEET - 2015
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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 :-

1. 23a

2. 43a

3. 34a

4. 32a

Subtopic:  Introduction & Crystal System |
 61%
From NCERT
NEET - 2014
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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?

1. 128

2. 157

3. 181

4. 108

 

Subtopic:  Introduction & Crystal System |
 78%
From NCERT
NEET - 2009
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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

1. 240.8 pm

2. 151.8 pm

3. 75.5 pm

4. 300.5 pm

Subtopic:  Introduction & Crystal System |
 86%
From NCERT
NEET - 2009
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The incorrect statement among the following is:

1. The fraction of the total volume occupied by the atoms in a primitive cell is 0.48.
2. Molecular solids are generally volatile.
3. The number of carbon atoms in a unit cell of diamond is 8.
4. The number of Bravais lattices in which a crystal can be categorized is 14.
Subtopic:  Voids, Radius Ratio & Coordination Number |
 65%
From NCERT
NEET - 2008
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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

Subtopic:  Introduction & Crystal System |
 85%
From NCERT
NEET - 2008
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Percentage of free space in a body centered cubic unit cell is

(1) 30%                       

(2) 32%

(3) 34%                       

(4) 28%

Subtopic:  Density & Packing Fraction |
 90%
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NEET - 2008
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With which one of the following elements silicon should be doped so as to give p-type of semiconductor?
(1) Germanium

(2) Arsenic

(3) Selenium

(4) Boron

Subtopic:  Density & Packing Fraction |
 67%
From NCERT
NEET - 2008
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