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easyMCQNEET 20212026Chemistry
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Which of the following statements is not correct?

  1. A
    The number of Bravais lattices in which a crystal can be categorized is
  2. B
    The fraction of the total volume occupied by the atoms in a primitive cell is
  3. C
    Molecular solids are generally volatile
  4. D
    The number of carbon atoms in an unit cell of diamond is

Solution & Step-by-step Explanation

Diamond crystallizes in a face-centered cubic (FCC) lattice where carbon atoms also occupy half of the tetrahedral voids.Total atoms = (corners) (faces) (tetrahedral voids) .So, there are carbon atoms per unit cell, not .Note: In option B, the packing fraction for primitive cubic is , so the empty space is .

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Try it yourself before checking the explanation above.

Which of the following statements is not correct?
A
The number of Bravais lattices in which a crystal can be categorized is
B
The fraction of the total volume occupied by the atoms in a primitive cell is
C
Molecular solids are generally volatile
D
The number of carbon atoms in an unit cell of diamond is

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