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The packing fraction for a body centred ...

The packing fraction for a body centred cube

A

0.74

B

0.76

C

0.68

D

0.86

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The correct Answer is:
C
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Packing fraction in a body - centred cubic cell of crystals is

The packing fraction in a face - centred cubic cell of crystals is

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The packing fraction of a simple cubic structure is pi//6 . Prove.

Calculate the efficiency of packing in case of a metal of body centered cubic crystal .

Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two dimension there are square close packing and hexagonal close packing, cubic close packing and body-centred cubic packing i) hcp: AB AB AB AB .... arrangement Coordination no. = 12 , % occupied space = 74% ii) ccp: ABC ABC ....... arrangement Coordination no. = 12, % occupied space = 74% iii) bec: 68% space is occupied. Coordination no= 8 17. The empty space left in hcp in three dimensions is

Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two dimension there are square close packing and hexagonal close packing, cubic close packing and body-centred cubic packing i) hcp: AB AB AB AB .... arrangement Coordination no. = 12 , % occupied space = 74% ii) ccp: ABC ABC ....... arrangement Coordination no. = 12, % occupied space = 74% iii) bec: 68% space is occupied. Coordination no= 8 17. The pattern of successive layers of cop arrange-ment can be designated as

AAKASH SERIES-SOLIDS STATE-OBJECTIVE EXERCISE - 1 (CLOSE PACKED STRUCTURES AND VOIDS)
  1. Which of the following has hcp crystal structure ?

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  2. {:("List I","List II"),("A) ccp","1) ABAB"),("B) hcp","2) BCC"),("C) C...

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  3. Coordination number for Cu is

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  4. Atoms of an element 'A' occupy tetrahedral voids in the hexagonal clos...

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  5. AB is an ionic solid. If the ratio of ionic radii of A^(+) and B^(+) i...

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  6. The percentages of void space for simple cubic, body centred cubic and...

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  7. Which of the following is an example of body centred cube ?

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  8. The co-ordination number of a metal crystallising in a hexagonal close...

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  9. An octahedral void is surrounded by how many spheres ?

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  10. How many Cl^(-) ions are there around Na^(+) ion in NaCl crystal

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  11. The void between two oppositly directed planar triangles of spheres in...

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  12. In a cubic close packed structure the number of nearest neighbours for...

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  13. Which of the following structure is most uncommon for metals?

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  14. Which of the following packing is more efficient:

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  15. The packing efficiency in a simple cubic cell system of crystals is

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  16. The packing fraction for a body centred cube

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  17. Density of a crystal is given by :

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  18. The percent of void space in a body - centred cubic lattice is :

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  19. Calculate the efficiency of the packaing in case of face - centered cu...

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