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NEET 2008
Exam
NEET
Year
2008
Subject
Chemistry
Chapter
Solid State

NEET 2008 · Chemistry · Solid State

Which of the following statements is not correct?

Which of the following statements is not correct?

Options

  1. AThe fraction of the total volume occupied by the atoms in a primitive cell is 0.48
  2. BMolecular solids are generally volatile
  3. CThe number of carbon atoms in an unit cell of diamond is 4
  4. DThe number of Bravais lattices in which a crystal can be categorized is 14

Correct answer

A. The fraction of the total volume occupied by the atoms in a primitive cell is 0.48

Step-by-step solution

Key Idea: Packing fraction of lattice structure or fraction of total volume occupied = Volume occupied by atoms in a unit cell  Volume of the unit cell =\frac{\text{ Volume occupied by atoms in a unit cell }}{\text{ Volume of the unit cell }} Packing fraction of simple cube =1×43πr3a3=1×43πr3(2r)3=0.52\begin{gathered} =\frac{1 \times \frac{4}{3} \pi r^3}{a^3}=\frac{1 \times \frac{4}{3} \pi r^3}{(2 r)^3} \\ =0.52 \end{gathered} (∵\because For primitive cell a=2ra=2 r) ∴\therefore Volume occupied =52%=52 \%
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