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  5. The Solid State / ठोस प्रावस्था

12th Class Chemistry The Solid State / ठोस प्रावस्था Question Bank Case Based (MCQs) - The Solid State

  • question_answer
    Directions: (Q. 1 to 5)
    Case I: Read the passage given below and answer the following questions from 1 to 5.
    In hexagonal system of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are regular hexagons and three atoms are sandwiched in between them. A space-filling model of this structure, called hexagonal close packed (hcp), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer.
    Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position.
    The number of atoms in this hcp unit cell is

    A) 4

    B) 6

    C) 12

    D) 17

    Correct Answer: B

    Solution :

    6


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