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NEET Chemistry NEET PYQ-The Solid State

  • question_answer
    The edge length of face centred unit cubic cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is:                [AIPMT 1998]

    A) 288 pm

    B) 398 pm

    C) 144 pm

    D) 618 pm

    Correct Answer: C

    Solution :

    [c] Edge length \[=2\,{{r}^{+}}\,+\,2\,{{r}^{-}}\]
                            \[\frac{508}{2}={{r}^{+}}+{{r}^{-}}\]
                            \[254=110+{{r}^{-}}\]
                            \[{{r}^{-}}=254-110=144\,pm\]


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