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J & K CET Engineering J and K - CET Engineering Solved Paper-2003

  • question_answer
    The ionic radii of isoelectronic species\[{{N}^{3-}},{{O}^{2-}}\]and \[{{F}^{-}}\]are in the order

    A)  1.36, 1.40, 1.71

    B)  1.36, 1.71, 1.40

    C)  1.71, 1.40, 1.36

    D)  1.71, 1.36, 1.40

    Correct Answer: C

    Solution :

     The size of isoelectronic species decreases with increasing nuclear charge. Hence, the order of ionic radii of \[{{N}^{3-}},{{O}^{2-}}\]and \[{{F}^{-}}\]is as: \[\begin{align}   & {{N}^{3-}}\,\,\,\,>\,\,\,{{O}^{2-}}\,\,\,>\,\,\,{{F}^{-}} \\  & 1.71\,\,\,\,\,\,\,\,1.40\,\,\,\,\,\,\,\,1.36 \\ \end{align}\]


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