Ice crystallizes in a hexagonal lattice having the volume of the unit cell as 132×10-24 cm3. If the density is 0.92 g/cm3 at a given temperature, then the number of H2O molecules per unit cell is : 

1. 1

2. 2

3. 3

4. 4

Subtopic:  Density & Packing Fraction |
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AB crystallizes in a body-centred cubic lattice with edge length a equal to 387 pm. The distance between two oppositely charged ions in the lattice will be : 

1. 250 pm

2. 200 pm

3. 300 pm

4. 335 pm

Subtopic:  Introduction & Crystal System |
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In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face
centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is

1.AB2

2.A2B3

3.A2B5

4.A2B

Subtopic:  Density & Packing Fraction |
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Percentage of free space in cubic close packed structure and in body centered packed structure are respectively:

1. 48% and 26%

2. 30% and 26%

3. 26% and 32%

4. 32% and 48%

Subtopic:  Density & Packing Fraction |
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Packing fraction of simple cubic crystal lattice is 

1. 38%

2. 74%

3. 68%

4. 52.4%

Subtopic:  Density & Packing Fraction |
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In which of the following crystals are alternate tetrahedral voids occupied:

1. NaCl

2. ZnS

3. CaF2

4. Na2O

Subtopic:  Voids, Radius Ratio & Coordination Number |
 61%
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In a metal oxide, the oxide ions are arranged in hexagonal close packing and metal ions occupy two third of the octahedral voids. The formula of the oxide is : 

1. MO

2. M2O3

3. MO2

4. M2O

Subtopic:  Density & Packing Fraction |
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The edge length of fcc unit cell of NaCl is 508 pm. If the radius of cation is 110 pm, then the radius of the anion is : 

1. 144 pm

2. 249 pm

3. 288 pm

4. 398 pm

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number |
 60%
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A crystal is made of particle X, Y & Z. X forms FCC packing, Y occupies all octahedral

voids of X and Zoccupies all tetrahedral voids of X, if all the particles along one body

diagonal is removed then the formula of the crystal would be –

(1) XYZ2

(2) X2YZ2

(3) X5Y4Z5

(4) X5Y4Z8

Subtopic:  Density & Packing Fraction |
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In a hypothetical solid C atoms are found to form cubical close packed lattice. Aatoms occupy all tetrahedral vioids& B atoms occupy all octahedral voids. A and B atoms are of appropriate size, so that there is no distortion in CCP lattice of C atoms. Now if a plane as shown in the following figure is cut.

Then the cross section of this plane will look like.

(1)

(2)

(3)

(4)

Subtopic:  Voids, Radius Ratio & Coordination Number |
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