Total volume of atoms present in a face centred cubic unit cell of a metal is -

(r is atomic radius)

1. 20/3 πr3

2. 24/3 πr3

3. 12/3 πr3

4. 16/3 πr3

Subtopic:  Voids, Radius Ratio & Coordination Number |
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The arrangement of Xions around A+ ion in solid AX is given in the figure (not drawn to scale).
If the radius of X is 250 pm, the radius of A+ is: 


1. 104 pm

2. 125 pm

3. 183 pm

4. 57 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
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The arrangement ABC ABC.. is referred to as.

1. octahedral close packing

2. hexagonal clase packing

3. tetrahedral close packing

4. cubic close packing

Subtopic:  Voids, Radius Ratio & Coordination Number |
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The ratio of cations to anion in a closed pack tetrahedral is:

1. 0.714

2. 0.225

3. 0.02

4. none of these

Subtopic:  Voids, Radius Ratio & Coordination Number |
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For a solid with the following structure, the co-ordination number of the point B is:

1. 3

2. 4

3. 5

4. 6

Subtopic:  Voids, Radius Ratio & Coordination Number |
 51%
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Compute the percentage void space per unit volume of unit cell in zinc fluoride structure.

1. 15.03%

2. 22.18%

3. 18.23%

4. 25.07%

Subtopic:  Voids, Radius Ratio & Coordination Number |
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8 : 8 co-ordination of CsCl is found to change into 6 : 6 co-ordination on:

1. Applying pressure.

2. Increasing temperature.

3. Both 1 and 2.

4. None of these.

Subtopic:  Voids, Radius Ratio & Coordination Number |
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The radius of Ag+ ion is 126 pm and that I- ion is 216 pm. The coordination number of Agion is

1. 2

2. 4

3. 6

4. 8

Subtopic:  Voids, Radius Ratio & Coordination Number |
 65%
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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 |
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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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