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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 4

  • question_answer
    The ions \[{{O}^{2-}},{{F}^{-}},N{{a}^{+}},M{{g}^{2+}}\]and \[A{{l}^{3+}}\]are isoelectronic. Their ionic radii show

    A) a decrease from \[{{O}^{2-}}\] to \[{{F}^{-}}\]and then increase from \[N{{a}^{+}}\]to \[A{{l}^{3+}}\]

    B) a significant increase from \[{{O}^{2-}}\]to \[A{{l}^{3+}}\]

    C) a significant decrease from\[{{O}^{2-}}\]to \[A{{l}^{3+}}\]

    D) an increase from\[{{O}^{2-}}\] to \[{{F}^{-}}\]and then decrease from \[N{{a}^{+}}\] to \[A{{l}^{3+}}\]

    Correct Answer: C

    Solution :

    [c] : Ionic radii of isoelectronic ions decrease with increase of nuclear charge thus, it shows a decrease from \[{{O}^{2-}}\] to \[A{{l}^{3+}}\]


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