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# Packing in crystals Test - The Solid State Class 12 Notes | EduRev

Created by: Arshdeep Kaur

## Class 12 : Packing in crystals Test - The Solid State Class 12 Notes | EduRev

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CBSE TEST PAPER-03
CLASS - XII CHEMISTRY (The Solid State)
Topic – Packing in crystals
1. What is square close packing? 
2. What is the coordination number in :-
(a) Square close packing  (b) Hexagonal close packing.

3. Define – (a) void (b) coordination Number 
4. What is the packing efficiency in
(a) hcp structure   (b) BCC structure    (c) Simple cubic structure

5. Give the relationship between density and edge length of a cubic crystal. 
6. Copper which crystallizes as a face – centred cubic lattice has a density of 8.93
g/cm
3
at 20
o
C. calculate the length of the unit cell.

7. An element crystallizes in BCC structure. The edge of its unit cell is 288 pm. If the
density is 7.2 glcm
3
, calculate the atomic mass of the element.

8. The compound CuCl has ZnS structure and the edge length of the unit cell in 500
pm. Calculate the density. (Atomic masses: Cu = 63, Cl = 35.5, Avogadro no = 6.02
× 10
23
mol
-1
)

9. In a compound, B ions form a close – packed structure & A ions occupy all the
tetrahedral voids. What is the formula of the compound?

10. In crystalline solid, anions C are arranged in cubic close – packing, cations A
occupy 50% of tetrahedral voids & cations B occupy 50% of octahedral voids.
What is the formula of solid?

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