An alloy of copper, silver and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body centre, the alloy has a formula-

(A) Cu4Ag2Au                               

(B) Cu4Ag4Au

(C) Cu4Ag3Au                               

(D) CuAgAu

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Frenkel defect is not found in the halides of alkali metals because alkali metals have

1. high electropositivity

2. high ionic radii

3. high reactivity

4. ability to occupy interstitial sites

Concept Questions :-

Voids and radius ratio/coordination number
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Iodine crystal are-

(A) Metallic solid                                       

(B) Ionic solid

(C) Molecular solid                                   

(D) Covalent solid

Concept Questions :-

Introduction and Type of Crystal System
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A solid PQ have rock salt type structure in which Q atoms are at the corners of the unit cell. If the body centred atoms in all the unit cells are missing, the resulting stoichiometry will be-

(A) PQ                                               

 (B) PQ2

(C) P3Q4                                             

(D) P4Q3

 

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8 : 8 co-ordination of CsCl is found to change into 6 : 6
co-ordination on:

(a) applying pressure
(b) increasing temperature
(c) both (a) and (b)
(d) none of these

Concept Questions :-

Introduction and Type of Crystal System
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At room temperature, sodium crystallises in a body centred cubic cell with a 4.24 A0. The theoretical density of sodium is- (Atomic mass of sodium=23.0 g mol-1)

(A) 2.05 g cm-3                                         

(B) 3.45 g cm-3

(C) 1.00 g cm-3                                         

(D) 3.55 g cm-3

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Which is amorphous solids-

(A) Rubber                                       

(B) Plastic

(C) Glass                                         

(D) All

Concept Questions :-

Introduction and Type of Crystal System
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In the unit cell of an fcc system the number of octahedral and tetrahedral holes are

(A) 4,4                                                 

(B) 4, 8

(C) 1, 8                                             

 (D) 4, 1

Concept Questions :-

Voids and radius ratio/coordination number
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Xenon crystallizes in face centre cubic lattice and edge of the unit cell is 620 pm, then the radius of Xenon atom is-

(A) 219.20 pm                                   

 (B) 438.5 pm

(C) 265.5 pm                                     

(D) 536.94 pm

Concept Questions :-

Voids and radius ratio/coordination number
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The unit cell of a metallic element of atomic mass 108 and density 10.5 g/cm2 is a cube with edge length of 409 pm. The structure of the crystal lattice is-

(A) fcc                                                         

(B) bcc

(C) hcp                                                       

 (D) None of these

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Difficulty Level: