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An octahedral void is surrounded by how ...

An octahedral void is surrounded by how many spheres ?

A

6

B

4

C

8

D

12

Text Solution

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The correct Answer is:
A
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(A) In close packing of spheres a tetrahedral void is surrounded by four spheres whereas an octahedral void is surrounded by six spheres. (R) A tetrahedral void has a tetrahedral shape whereas an octahedral void has an octa-hedral shape.

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Structure of a mixed oxide is cubic close-packed (ccp). The unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

In an oxide Ore half of tetrahedral voids are occupied by A^(+x) ions and half of the octahedral voids are occupied by B^(+y) y in the ‘hcp' arrangement of oxide ions. What is (x+y) ?

In a cubic closed packed structure of mixed oxide, the oxide ions are in CCP arrangement 1/6 of tetrahedral voids are occupied by cations A and 1/2 of octahedral voids are occupied by cations B. The formula of the oxide is

A spinel is an important class of oxides consisting of two types of metal ions with oxide ions arranged in CCP layers. The normal spinel has 1/8 th of the tetrahedral void occupied by one type of metal and one half of the octahedral voids occupied by another type of metal ions such a spinel is formed by Zn^(2+), Al^(3+) and O^(2-) with Zn^(2+) in tetrahedral void. Then the simplest formula of that spinel is Zn_(x)Al_(y)O_(z) then x + y + z is

What relation holds good between the numbers of octahedral and tetrahedral holes in a lattice formed by spheres ?

If the radius of the octahedral void is r and radius of the atoms in close packing is R , derive relation between r and R .

Following is the fact about the newly discovered superconductor of C_(60) (fullerene). The alkali metal fulleride superconductor M_(3)C_(60) has a cubic closest-packed (face-centered cubic) arragement of nearly spherical C_(60)^(3-) anions with M^(+) cations in the holes between the larger C_(60)^(3-) ions. The holes are of two types-octahedral holes, which are surrounded octahedrally by six C_(60)^(3-) ions, and tetrahedral holes, which are surrounded tetrahedrally by four C_(60)^(3-) ions. How many C_(60)^(3-) ions, octahedral holes, and tetrahedral holes are present per unit cell

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AAKASH SERIES-SOLIDS STATE-OBJECTIVE EXERCISE - 1 (CLOSE PACKED STRUCTURES AND VOIDS)
  1. Which of the following has hcp crystal structure ?

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  2. {:("List I","List II"),("A) ccp","1) ABAB"),("B) hcp","2) BCC"),("C) C...

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  3. Coordination number for Cu is

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  4. Atoms of an element 'A' occupy tetrahedral voids in the hexagonal clos...

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

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  6. The percentages of void space for simple cubic, body centred cubic and...

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

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  8. The co-ordination number of a metal crystallising in a hexagonal close...

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  9. An octahedral void is surrounded by how many spheres ?

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  10. How many Cl^(-) ions are there around Na^(+) ion in NaCl crystal

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  11. The void between two oppositly directed planar triangles of spheres in...

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  12. In a cubic close packed structure the number of nearest neighbours for...

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  13. Which of the following structure is most uncommon for metals?

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  14. Which of the following packing is more efficient:

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  15. The packing efficiency in a simple cubic cell system of crystals is

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  16. The packing fraction for a body centred cube

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  17. Density of a crystal is given by :

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

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

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