Copper metal has a face-centered cubic structure with the unit cell length equal to 0.361 nm. Picturing copper ions in contact along the face diagonal. The apparent radius of a copper ion is-

(A) 0.128                                         

(B) 1.42

(C) 3.22                                           

(D) 4.22

Subtopic:  Density & Packing Fraction |
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Choose the correct matching sequence from the possibilities given

(a) Crystal defect  (i) AB AB AB. . . . type crystal
(b) hcp  (ii) Covalent crystal
(c) CsCl    (iii) Frenkel
(d) Diamond  (iv) Face centered in cube
(e) NaCl (v) Body centered in cube
 
(a) (b) (c) (d) (e)
(1) (iii) (i) (ii) (v) (iv)
(2) (iii) (i) (v) (ii) (iv)
(3) (iii) (v) (i) (ii) (iv)
(4) (v) (iii) (iv) (ii) (i)
Subtopic:  Imperfections in Solids & Semiconductors |
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A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-

(1) AuCu                                                   

(2) AuCu2

(3) AuCu3                                                 

(4) None of these 

Subtopic:  Density & Packing Fraction |
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The correct statement(s) among the above is -
a. The coordination number of a cation occupying a tetrahedral hole is 4.
b. The coordination number of a cation occupying an octahedral hole is 6.
c. In Schottky defect, the density of the lattice decreases.

1. a, b                                         

2. b, c

3. a, b, c                                     

4. a, c

Subtopic:  Introduction & Crystal System |
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Among the following types of voids, which one is the largest void-

(1) Triangular system                             

(2) Tetragonal system

(3) Monoclinic system                             

(4) Octahedral

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number | Magnetic Behaviour of an Element/Compound |
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Bragg’s equation is-

(1) nλ=2θsinθ                               

(2) nλ=2dsinθ

(3) 2nλ=dsinθ                               

(4) λ=2d/nsinθ

Subtopic:  Imperfections in Solids & Semiconductors |
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The n of a cubic unit cell is 4. The type of cell as-

(1) Body centred                               

(2) Face centred

(3) Primitive                                     

(4) None of these

Subtopic:  Introduction & Crystal System |
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Close packing is maximum in the crystal which is-

(1) Simple cube                               

(2) bcc

(3) fcc                                             

(4) None

Subtopic:  Voids, Radius Ratio & Coordination Number |
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In a face centred cubic arrangement of metallic atoms, what is the relative ratio of the sizes of tetrahedral and octahedral voids ?

(1) 0.543                                   

 

(2) 0.732

(3) 0.414                                   

(4) 0.637

Subtopic:  Voids, Radius Ratio & Coordination Number |
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A rhombohedral unit cell is shown. What is its volume ?
Side length = a Å.

(1) a33                               

(2) a332

(3) a32                             

(4) a3 32

Subtopic:  Density & Packing Fraction |
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