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NEET2008ChemistrySolid StateActual

Which of the following statements is not correct?

Options

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

Correct answer

D. The number of carbon atoms in an unit cell of diamond is 4

Step-by-step 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 .

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