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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

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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-SOLID STATE-OBJECTIVE EXERCISE -1
  1. The fraction of the total volume occupied by the atoms present in a si...

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  2. In the structure given below, the sites S(1) and S(2) represent

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  3. The packing fraction for a body centred cube

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  4. Density of a crystal is given by :

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

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

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  7. Coordination number for Cu is

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  8. Which of the following has hcp crystal structure ?

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  9. The intermetallic compound LiAg crystallizes in cubic lattice in which...

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  10. In a cubic closed packed structure of mixed oxide, the oxide ions are ...

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  11. Which of the following has both Schottky and Frenkel defects.

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  12. Due to Frenkel defect, the density of the ionic solids

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  13. The ratio of Fe^(3+) and Fe^(2+) ions in Fe(0.9)9S(1.0) is

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  14. Which of the following has Frenkel defect?

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  15. In AgBr, there can occur

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  16. If NaCl is doped with 10^(4) mol % of SrCl(2) the concentration of cat...

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

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  18. For an octahedral radius ratio limit is

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

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  20. Atoms of an element 'A' occupy 2/3 tetrahedral voids in the hexagonal ...

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