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In a CCP structure of compound XY, X ato...

In a CCP structure of compound XY, X atoms are present at octahedral voids. Calculate the number of nearest neighbours upto 6th C.N. for an X atom located at body centre.

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X `to` at O-voids
`Y to` in CCP (i.e. at corners and at face centres )
1st C.N.=6 ( Y at six face centres)
2nd C.N.=12 (X at 12 edge centres )
3rd C.N.=8 (Y at 8 corners )
4th C.N.=6 (X at six body centres of other adjacent unit cells)
5th C.N.=24 (Y at four adjacent face-centres of each of six adjacent unit cells )
6th C.N.=24 (X at four adjacent edge-centres of each of six adjacent unit cells)
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AAKASH INSTITUTE-THE SOLID STATE -Assignment (SECTION - D) (ASSERTION-REASON TYPE QUESTION)
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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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  9. A : NaCl shows Schottky defect at room temperature. R : NaCl shows...

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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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