Manipal Medical Manipal Medical Solved Paper-2013

  • question_answer
    When the following five anions are arranged in order of decreasing ionic radius, the correct sequence is

    A)  \[S{{e}^{2-}},{{I}^{-}},B{{r}^{-}},{{O}^{2-}},{{F}^{-}}\]

    B)  \[{{I}^{-}},S{{e}^{2-}},B{{r}^{-}},{{O}^{2-}},{{F}^{-}}\]

    C)  \[{{I}^{-}},S{{e}^{2-}},{{O}^{2-}},B{{r}^{-}},{{F}^{-}}\]

    D)  \[S{{e}^{2-}},{{I}^{-}},B{{r}^{-}},{{F}^{-}},{{O}^{2-}}\]

    Correct Answer: B

    Solution :

     \[\left| \begin{matrix}    O  \\    S  \\    Se  \\    {}  \\ \end{matrix} \right|\left| \begin{matrix}    F  \\    Cl  \\    Br  \\    I  \\ \end{matrix} \right|\]Thus, \[F<O,{{F}^{-1}}<{{O}^{2-}};I>Br>F,\] \[{{I}^{-}}>B{{r}^{-}}>{{F}^{-}};Se>O,S{{e}^{2-}}>{{O}^{2-}};I>Se,{{I}^{-1}}>S{{e}^{2-}}\] Therefore, the order is\[{{I}^{-}}>S{{e}^{2-}}>B{{r}^{-}}>{{O}^{2-}}>{{F}^{-}}\]


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