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NEET AIPMT SOLVED PAPER 1998

  • 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:                                                                                                                              

    A)                 288 pm 

    B)                                            398 pm                

    C)                 144 pm                                

    D)                 618 pm

    Correct Answer: C

    Solution :

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


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