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-

(A) AuCu                                                   

(B) AuCu2

(C) AuCu3                                                 

(D) None of these 

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Select the correct statement (s) -

(a) The C.N. of cation occupying a tetrahedral hole is 4.

(b) The C.N. of cation occupying a octahedral hole is 6.

(c) In schottky defects, density of the lattice decreases,

(A) a, b                                         

(B) b, c

(C) a, b, c                                     

(D) a, c

Concept Questions :-

Introduction and Type of Crystal System
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Among the following types of voids, which one is the largest void-

(A) Triangular system                             

(B) Tetragonal system

(C) Monoclinic system                             

(D) Octahedral

Concept Questions :-

Introduction and Type of Crystal System
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Bragg’s equation is-

(A) nλ=2θsinθ                               

(B) nλ=2dsinθ

(C) 2nλ=dsinθ                               

(D) λ=2d/nsinθ

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The rank of a cubic unit cell is 4. The type of cell as-

(A) Body centred                               

(B) Face centred

(C) Primitive                                     

(D) None of these

Concept Questions :-

Introduction and Type of Crystal System
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Close packing is maximum in the crystal which is-

(A) Simple cube                               

(B) bcc

(C) fcc                                             

(D) None

Concept Questions :-

Voids and 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 ?

(A) 0.543                                   

 (B) 0.732

(C) 0.414                                   

(D) 0.637

Concept Questions :-

Voids and radius ratio/coordination number
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A body centred cubic arrangement is shown : O is the body centre; A, B, C, D,......., H are the corners. What is the magnitude of the angle AOB ?

(A) 120°                                 

(B) 109°28'

(C) 104°31'                           

 (D) 70°32'

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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A rhombohedral unit cell is shown. What is its volume ?
Side length = a Å.

(A) a33                               

(B) a332

(C) a32                             

(D) a3 32

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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A crystal formula AB3 has A ions at the cube corners and B ions at the edge centres. The coordination numbers of A and B are respectively 

(A) 6 and 6                                                 

 (B) 2 and 6

(C) 6 and 2                                                 

 (D) 8 and 8

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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