Q84 / 199 · NEET 2008 (Mains) · Chemistry

Which of the following statements is not correct?

  • A
    The number of Bravais lattices in which a crystal can be categorized is 14
  • B
    The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
  • C
    Molecular solids are generally volatile
  • Correct answer
    D
    The number of carbon atoms in an unit cell of diamond is 4

Solution

Diamond has ZnS type structure. So, no. of atoms in a unit cell of diamond is 8 . Note : But option (2) is also incorrect because the fraction of the total volume occupied by the atoms in a cubic primitive cells is 0.524 .

Hence, the correct answer is option: 'D'.

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