NEET Chemistry The Solid State Questions Solved

NEET - 2008

Percentage of free space in a body centered cubic unit cell is

(a) 30%                       (b) 32%

(c) 34%                       (d) 28%

Concept Videos :-

#9 | FCC Unit Cell: Packing Fraction
#20 | Rank of HP Unit Cell
#21 | Packing Fraction of HP Unit Cell
#24 | Density of Unit Cell

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors

Key Idea:

Packing fraction = Volume occupied by atoms in a unit cell

                                 Volume of the unit cell

For body centered cube,

Packing fraction = 2x43πr3(4r/3)3 = 3π8 = 0.68

where, edge length a = 4r/3

... Volume occupied = 68%

and volume vacant =32%

Difficulty Level:

  • 3%
  • 84%
  • 8%
  • 7%
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