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

## 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? [1]
2. What is the coordination number in :-
(a) Square close packing  (b) Hexagonal close packing.
[1]
3. Define – (a) void (b) coordination Number [2]
4. What is the packing efficiency in
(a) hcp structure   (b) BCC structure    (c) Simple cubic structure
[3]
5. Give the relationship between density and edge length of a cubic crystal. [2]
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.
[3]
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.
[3]
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
)
[3]
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?
[2]
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?
[3]
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