A metallic element exists as a 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 -

(1) 6.85×102                             

(2) 5.82×1023

(3) 4.37×105                             

(4) 2.12×106

Subtopic:  Density & Packing Fraction |
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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)

(1) 7.92g ml-1                                   

 

(2) 8.96g ml-1

(3) 2.78g ml-1                                     

(4) 6.72g ml-1

Subtopic:  Density & Packing Fraction |
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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 centers and gold is present at the body center, the alloy has a formula-

(1) Cu4Ag2Au                               

(2) Cu4Ag4Au

(3) Cu4Ag3Au                               

(4) CuAgAu

Subtopic:  Density & Packing Fraction |
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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

Subtopic:  Voids, Radius Ratio & Coordination Number |
 57%
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Iodine crystals are classified as-

1. Metallic solids.                                  

2. Ionic solids.

3. Molecular solids .                                 

4. Covalent solids.

Subtopic:  Introduction & Crystal System |
 67%
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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

 

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number |
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At room temperature, sodium crystallizes in a body-centered 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

Subtopic:  Density & Packing Fraction |
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Which is amorphous solids-

(1) Rubber                                       

(2) Plastic

(3) Glass                                         

(4) All

Subtopic:  Introduction & Crystal System |
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In the unit cell of an fcc system, the number of octahedral and tetrahedral holes are

(1) 4,4                                                 

(2) 4, 8

(3) 1, 8                                             

(4) 4, 1

Subtopic:  Voids, Radius Ratio & Coordination Number |
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If Xenon crystallizes in face center cubic lattice and the edge of the unit cell is 620 pm, then the radius of the Xenon atom is-

1. 219.20 pm                                   

2. 438.5 pm

3. 265.5 pm                                     

4. 536.94 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
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