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NEET Chemistry The Solid State / ठोस प्रावस्था Question Bank Self Evaluation Test - The Solid State

  • question_answer
    A mineral having the formula \[A{{B}_{2}}\] crystallizes in ccp lattice with A atoms occupying the lattice points. Pick out the correct statement of the following

    A) 100% occupancy of tetrahedral voids, C.N. of \[B=4\]

    B) 100% occupancy of octahedral voids, C.N. of B=4

    C) 50% occupancy of tetrahedral voids, C.N. of A=4

    D) 100% occupancy of octahedral voids, C.N. of A =4

    Correct Answer: A

    Solution :

    [a] Number of A cations per unit cell = 4 Number of B anions per unit cell must be \[=2\times 4=8\] Number of tetrahedral voids per unit cell \[=2\times 4=8\] Number of octahedral voids per unit all \[=1\times 4=4.\] Hence, occupancy of tetrahedral voids =100%


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