The edge length of cube is 400pm. Its body diagonal would be-

(A) 500 pm                                         

 (B) 693 pm

(C) 600 pm                                           

(D) 566pm

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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A metallic element exists as cubic lattice. Each edge of the unit cell is 2.88 A0. The density of the metal is 7.20 g cm-3. How many unit cell will be present in 100 g of the metal -

(A) 6.85×102                             

(B) 5.82×1023

(C) 4.37×105                             

(D) 2.12×106

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Iron crystallizes in a b.c.c. system with a lattice parameter of 2.861 A0. Calculate the density of iron in the b.c.c. system (Atomic weight of Fe = 56, NA=6.02×1023mol-1)

(A) 7.92g ml-1                                   

 (B) 8.96g ml-1

(C) 2.78g ml-1                                     

(D) 6.72g ml-1

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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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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Difficulty Level: