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CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    A substance \[{{A}_{x}}{{B}_{y}}\] crystallises in a face centred cubic lattice in which A atom occupies each comer of cube and atom B occupies the centres of each face of the cube. Identify the correct composition of the substance\[{{A}_{x}}{{B}_{y}}\].

    A)  \[A{{B}_{3}}\]

    B)  \[{{A}_{4}}{{B}_{3}}\]

    C)  \[{{A}_{3}}B\]

    D)  Composition cannot be specified

    Correct Answer: A

    Solution :

                    Number of atoms of A per unit cell \[=8\times \frac{1}{8}=1\] Number of atoms of B per unit cell \[=6\times \frac{1}{2}=3\] Hence, the composition of\[{{A}_{x}}{{B}_{y}}=A{{B}_{3}}\]


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