When an electron in an excited Mo atom falls from L to the K shell, an X-ray is emitted. These X-rays are diffracted at angle of 7.75o by planes with a separation of 2.64Å. What is the difference in energy between K-shell and L-shell in Mo assuming a first-order diffraction. (sin7.75o=0.1349)

(1) 36.88 ×1015J

(2) 27.88×1016J

(3) 63.88 ×1017J

(4) 64.88×1016J

Subtopic:  Introduction & Crystal System |
 66%
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Hints

Which is the incorrect statement?

(1) Fe0.95O has non-stoichiometric metal deficiency defect

(2) Density decreases in case of crystals with Schottky's defect

(3) NaCI(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal

(4) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal

Subtopic:  Imperfections in Solids & Semiconductors |
 69%
From NCERT
NEET - 2017
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In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) and fluoride ion (F-) are

(1) 4 and 2                   

(2) 6 and 6

(3) 8 and 4                   

(4) 4 and 8

Subtopic:  Introduction & Crystal System |
 64%
NEET - 2016
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Hints

Lithium has a bcc structure. Its density is 530 kg m-3 and its atomic mass is 6.94 gmol-1.

The edge length of a unit cell of lithium metal is -

(NA=6.02 x1023 mol-1)

1. 352 pm

2. 527 pm

3. 264 pm

4. 154 pm

 

Subtopic:  Density & Packing Fraction |
 53%
From NCERT
NEET - 2016
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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%
From NCERT
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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