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Which of the following statements is...

Which of the following statements is not true about the hexagonal close packing ?

A

The coordination number is `12`

B

It has `74%` packing efficiency

C

Tetrahedral voids of the second layer are covered by the spheres of the third layer.

D

In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer

Text Solution

Verified by Experts

The correct Answer is:
D
It has AB AB AB type of arrangement and therefore, fourth layer is not aligned with particls of first layer.
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MODERN PUBLICATION-SOLID STATE-NCERT EXEMPLAR PROBLEMS (MULTIPLE CHOICE QUESTIONS) (TYPE I)
  1. Schottky defect is observed in crystals when ……………. .

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  2. Which of the following is true about the change the charge acq...

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  3. To get a n- type semiconductor from silicon , it should be doped...

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  4. The total of tetrahedral voids in the face centred unit cell is ……...

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  5. Which of the following point defects are shown by AgBr (s) crys...

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  6. In which pair most efficient packing is present?

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  7. The percentage of empty space in a body centred cubic arrangement is :

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  8. Which of the following statements is not true about the hexagon...

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  9. in which of the following structures coordination number for cati...

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

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  11. which kind of defects are introduced by doping ?

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  12. Silicon doped with electron rich impurity forms ………..

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  13. Which of the following statements is not true ?

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  14. which of the following is not true about the ionic solids ?

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  15. A ferromagnetic substance becomes a permanent magnet when it is placed...

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  16. The correct order of the packing effeciency in different types of uni...

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  17. which of the follwing defects is also known as dislocation defect ...

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  18. in the cubic packing , the unit cell has ………. .

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  19. The edge lengths of the unit cells in terms of the radius of spheres c...

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  20. which of the following represents correct order of conductivity ...

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