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In a CCP structure, calculate the minimu...

In a CCP structure, calculate the minimum distance between two tetrahedral voids.

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To calculate the minimum distance between two tetrahedral voids in a CCP (cubic close-packed) structure, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Tetrahedral Voids**: - In a CCP structure, tetrahedral voids are formed when four spheres are arranged in a tetrahedral shape. To visualize this, consider placing three spheres in a triangular formation on a plane and then placing a fourth sphere directly above the center of this triangle. 2. **Visualizing the CCP Structure**: ...
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In Zinc blende structure, Zn^(+2) ions are present in alternate tetrahedral voids and S^(-2) in ccp. The coordination number of Zn^(+2) and S^(-2) are respectively

In HCP or CCP constituent particles occupy 74% of the available space. The remaining space (26%) in between the spheres remains unoccupied and is called interstitial voids or holes. Considering the close packing arrangement, each sphere in the second layer rests on the hollow space of the first layer, touching each other. The void created is called tetrahedral void. If R is the radius of the spheres in the close packed arrangement then, R (radius of tetrahedral void) = 0.225 R In a close packing arrangement, the interstitial void formed by the combination of two triangular voids of the first and second layer is called octahedral coid. Thus, double triangular void is surrounded by six spheres. The centre of these spheres on joining, forms octahedron. If R is the radius of the sphere. in a close packed arrangement then, R (radius of octahedral void = 0.414 R). In the spinel structure, oxide ions are cubic close packed whereas 1/8th of tetrahedral voids are occupied by A^(2+) cations and 1/2 of octahedral voids are occupied by B^(3+) cations. The general formula of the compound having spinel structure is

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AAKASH INSTITUTE ENGLISH-THE SOLID STATE -Assignment (SECTION - D) (ASSERTION-REASON TYPE QUESTION)
  1. In a CCP structure, calculate the minimum distance between two tetrahe...

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  2. A : In NaCl structure, the interionic distance is a/2 (a = Unit cell e...

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  3. A : The co - ordination number of CaF(2) is 8 : 4. R : Ca^(2+) ion...

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  4. A : The number of spheres are equal to the number of octahedral voids ...

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  5. A : In Schottky defect, density of crystal decreases. R : Equal nu...

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  6. A : If a tetrad axis is passed through the unit cell of NaCl and all i...

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  7. A : A particle at the corner of CCP unit cell has (1)/(8)th of its con...

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  8. A : Glass belongs to the category of covalent network solid. R : U...

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  9. A : NaCl shows Schottky defect at room temperature. R : NaCl shows...

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  10. A : Fe(3)O(4) is ferrimagnetic at room temperature but becomes paramag...

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  11. A : In molecular solids the lattice points are occupied by the atoms o...

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  12. A : Silicon is insulator at 0 K but semiconductor at room temperature....

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  13. A : Amorphous solids are isotropic. R : Amorphous solids are not rig...

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  14. A : In NaCl coordination number of Cl^(-) ion is 6 but in CsCl coordin...

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  15. A : All crystals of same substance possess the same elements of symmet...

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  16. A : AgBr shows both Schottky and Frenkel defect. R : AgBr is a cry...

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  17. A : Number of carbon atoms per unit cell in diamond is 8. R : The ...

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  18. A : The coordination number of ionic compound depends upon radius rati...

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  19. A : Number of rectangular plane in a cubic crystal is 3. R : Recta...

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  20. A : ccp is more efficient than hcp. R : Packing fraction is differe...

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  21. A : Coordination number of both Na^(+) and Cl^(-) NaCl is 6. R : Se...

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