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which of the following statemets is ...

which of the following statemets is not true about the hexagonal close packing ?

A

In hcp, atoms occupy 74% the available space

B

It is AB AB type packing in which third layer is aligned with the first layer

C

Be, Mg, Mo etc. are found to have hcp structure

D

The coordination number is 6

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The correct Answer is:
D
The coordination number is 12
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Which of the following statements is/are correct about hexagonal close packing ? 1. The coordination number is 8 2. It is ABAB type packing in which third layer is aligned with the first layer 3. Be, Mg, Mo etc. are found to have hcp structure 4. In hcp, atoms occupy 74% of the available space

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NCERT FINGERTIPS-THE SOLID STATE -Number Of Atoms In Unit Cell And Close Packed Structures
  1. A metallic crystal cystallizes into a lattice containing a sequence of...

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  2. In ccp arrangement the pattern of successive layers can be designated ...

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  3. which of the following statemets is not true about the hexagona...

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  4. The cordination number of a metal crystallising in a hexagonal close-p...

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  5. Match the column I with Column II and mark the appropriate choice .

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  6. IF the radius ratio of cation to anion is in the range of 0.2...

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  7. A crystal lattice with alternate +ve "and "-veions has radius ratio o...

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  8. A solid AB has the NaCL structure, If radius of cation A^(+) is 120 pm...

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  9. A crystal is formed by two elements X and Y in cubic structure. X atom...

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  10. If there elements X, Y & Z crystallize in cubic solid lattice with X- ...

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  11. A compound formed by two elements M and N. Element N forms ccp and ato...

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  12. A cubic solid is made up iof two elements X and Y . Atoms Y are presen...

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  13. How many chloride ions are there around sodium ion in sodium chloride ...

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  14. In NaCl structure , all the :

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  15. 8:8 coordination of CsCl is found to change into 6:6 coordination :

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  16. In CsCI lattice the coordination number of Cs ion is

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  17. Which is /are correct statement about zinc blende structure ?

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  18. The unit cell shown in the figure belongs to

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  19. The coordination number of Y will be

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  20. Which of the following about the above structure is not correct ?

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