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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Crystal structure and Coordination number

  • question_answer
    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      [AIIMS 2000]

    A) \[{{X}_{2}}Y\]    

    B) \[{{X}_{3}}Y\]

    C) \[X{{Y}_{2}}\]    

    D) \[X{{Y}_{3}}\]

    Correct Answer: D

    Solution :

    X atoms are at eight corners of the cube. Therefore, the number of X atoms in the unit cell \[=\frac{8}{8}=1\]. Y atoms are at the face centre of six faces. Therefore, its share in the unit cell \[=\frac{6}{2}=3\].  The formula is \[X{{Y}_{3}}\].


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