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NEET AIPMT SOLVED PAPER SCREENING 2004

  • question_answer
    A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the comers of a cube and the Y atoms are at the face-centres. The formula of the compound is:

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

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

    C) XY                                  

    D) \[X{{Y}_{2}}\]

    Correct Answer: A

    Solution :

    In unit cell, X-atoms at the corners \[=\frac{1}{8}\times 8=1\] \[Y-\]atoms at the face centres\[=\frac{1}{2}\times 6=3\] Ratio of X and \[Y=1:3\] Hence, formula is \[X{{Y}_{3}}.\]


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