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NEET Sample Paper NEET Sample Test Paper-69

  • question_answer
    In a fee arrangement of A and B atoms, where A atoms are at the comers of the unit cell, B atoms at the face centers, two atoms are missing from two comers in each unit cell, then the simplest formula of the compound is

    A) \[{{A}_{7}}{{B}_{6}}\]                       

    B) \[{{A}_{6}}{{B}_{7}}\]

    C) \[{{A}_{7}}{{B}_{24}}\]                     

    D) \[A{{B}_{4}}\]

    Correct Answer: D

    Solution :

    Since there are six atoms in the corner of the unit cell. So, contribution of atoms in 1 unit cell is \[\frac{6}{8}\]. Since 3 face-centered atoms contributes to one unit cell So, formula is \[{{\operatorname{Ag}}_{6/8}}\,{{B}_{3}}\] or \[{{A}_{6}}\,{{B}_{24}},\,\,\,\,\,or\,\,\,\,\,\,A{{B}_{4}}\]


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