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KVPY Sample Paper KVPY Stream-SX Model Paper-8

  • question_answer
    A compound of formula \[{{A}_{2}}{{B}_{3}}\]has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms:

    A) hcp lattice - A, \[\frac{2}{3}\] Tetrahedral voids - B

    B) hcp lattice - A, \[\frac{1}{3}\] Tetrahedral voids - B

    C) hcp lattice - B, \[\frac{2}{3}\] Tetrahedral voids - A

    D)  hcp lattice - B, \[\frac{1}{3}\] Tetrahedral voids - A

    Correct Answer: A

    Solution :

    Formula of the compounds No. of octahedral voids are equal to the number of atoms forming lattice A occupy octahedral void i.e., 2/3 of them B forms crystal lattice \[{{A}_{2/3}}B\Rightarrow {{A}_{2}}{{B}_{3}}.\]


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