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NEET Sample Paper NEET Sample Test Paper-71

  • question_answer
    The mass of unit cell of \[Ca{{F}_{2}}\] \[\left( fluorite structure \right)\] corresponds to

    A) \[\operatorname{mass}\,\,of\,\,8C{{a}^{++}}\,ions\,\,and\,\,4{{F}^{-}}\,ions\]

    B) \[\operatorname{mass}\,\,of\,\,4C{{a}^{++}}\,ions\,\,and\,\,8{{F}^{-}}\,ions\]

    C) \[\operatorname{mass}\,\,of\,\,4C{{a}^{++}}\,ions\,\,and\,\,4{{F}^{-}}\,ions\]

    D) \[\operatorname{mass}\,\,of\,\,1C{{a}^{++}}\,ions\,\,and\,\,2{{F}^{-}}\,ions\]

    Correct Answer: B

    Solution :

    In \[Ca{{F}_{2}}\] (calcium fluorite) structure, 1-unit cell contains \[4\,C{{a}^{2+}}\] ions and 8F ions. So, mass of unit cell of \[Ca{{F}_{2}}=\] mass of \[4\,C{{a}^{2+}}\] ions + mass of 8F ions.


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