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The arrangement of the first two layers,...

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is

A

exactly same in both cases

B

partly same and partly different

C

different from each other

D

nothing difinite.

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The correct Answer is:
A
The arrangment of first two layers in hcp and ccp is exactly same .
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The arrangement of the first two layers, one above the other, in hep and ccp arrangement is

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All real structures are three dimensional structures. They can be obtained by stacking two dimensional layers one above the other while placing the second square dose packed layer above the first we follow the same rule that was followed when one row was placed adjacent to the other. The second layer is placed over the first layer such that the spheres of the upper layer are exactly above there of the first layer. In his arrangement spheres of both the layers are perfectly aligned horizontally as well as vertically. A metallic element crystallise into a lattice having a ABC ABC pattern and packing of spheres leaves out voids in the lattice. Which of the following statements is not true for unit cell?

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NIKITA PUBLICATION-SOLID STATE -Multiple Choice Questions (III. PACKING OF CONSTITUENT PARTICLES, RADIUS RATIO )
  1. The vacant space in bcc lattice unit cell is

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  2. The arrangement of the first two layers, one above the other, in hcp a...

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  3. The vacant space in bcc lattice unit cell is :

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  4. Packing refers to the arrangement of constituent units in such a way t...

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  5. Close packing is maximum in the crystal which is

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  6. The number of atoms per unit cell in bcc lattice is

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  7. In a closest packed lattice, the number of tetrahedral voids formed wi...

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  8. If in a closest packed arrangement r is the radius of the sphere respr...

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  9. In the crystals structures of sodium chloride, the arrangement of Cl^(...

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  10. If the corrdination number of an element in its crystal lattice is 8, ...

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  11. The total number of identical spheres required in cubic close packing ...

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  12. The vacant space in bcc lattice unit cell is :

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  13. the correct order of the packing effeciency in different types o...

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  14. If in a closest packed arrangement r is the radius of the sphere respr...

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  15. Which of the following does not adopt hcp structure ?

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  16. What is the coordination number in a square close packed structures in...

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  17. The regular three dimensional arrangement of points in a crystal is kn...

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  18. All nobe gases crystallise in the ccp kstructure except

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  19. ccp as same as with

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  20. The arranegement ABC, ABC, ABC ……. is referred as

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