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What is the total number of atoms per un...

What is the total number of atoms per unit cell in a face centred cubic (fcc) structure ?

A

6 at edge centres and8 along body diagonals

B

12 at edge centres and one at body centre

C

8 along body diagonal and6 at edge centtres

D

all the edge centres only .

Text Solution

Verified by Experts

The correct Answer is:
B
In fcc or ccp, 12 octahedral voids are present at edge centres and one at the body centre.
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NIKITA PUBLICATION-SOLID STATE -Multiple Choice Questions (III. PACKING OF CONSTITUENT PARTICLES, RADIUS RATIO )
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  2. In a face centred cubic lattice the number of nearest neighbours for a...

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  3. What is the total number of atoms per unit cell in a face centred cubi...

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  6. A solid is made of two element X and Y .The atoms Z are in C CP arrang...

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  7. In a closest packed lattice, the number of octahedral sites as compare...

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  8. Which one of the following is not a close packing ?

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  9. The coordination number of each atom in body centered cubic unit cell...

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  10. the number of tetrahedral voids per unit cell in NaCl crystal is ...

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  11. What is the coordination number of sodium ions in the case of sodium c...

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

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  13. In which of the following crystals, alternate tetrahedral voids are oc...

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  14. Which of the following statements is not true about NaCl struture ?

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  15. Which of the following statements is not true about NaCl structure?

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  16. For tetrahedral coordination number, the radius ratio (r(c^(+)))/(r(a^...

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  17. A metallic crystal cystallizes into a lattice containing a sequence of...

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  18. In A^(+)B^(-) ionic compound radii of A^(=) and B^(-) ions are 180 "pm...

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  19. For cubic - coordination the value of ratio is

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  20. If the ratio is in the range of 0.414- 0.732 , then the coordination n...

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