In a cubic structure of compound which is made from X and Y, where X atoms are at the corners of the cube and Y at the face centres of the cube. The molecular formula of the compound is:

  1. A

    X2Y

  2. B

    X3Y

  3. C

    XY2

  4. D

    XY3

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    Solution:

    X atoms are at eight corners of the cube. Therefore, the number of X atoms in the unit cell =88=1. Y atoms are at the face centre of six faces. Therefore, its share in the unit cell =62=3. The formula is XY3.

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