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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 1

  • question_answer
    \[N{{a}^{+}},\] \[M{{g}^{2+}},\] \[A{{l}^{3+}}\] and \[S{{i}^{4+}}\] ions are isoelectronic. The of ionic radii of these ions.

    A) \[N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]

    B) \[N{{a}^{+}}<M{{g}^{2+}}<A{{l}^{3+}}<S{{i}^{4+}}\]

    C) \[N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}<S{{i}^{4+}}\]

    D) \[N{{a}^{+}}<M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]

    Correct Answer: A

    Solution :

    Species \[N{{a}^{+}}\] \[M{{g}^{2+}}\] \[A{{l}^{3+}}\] \[S{{i}^{4+}}\]
    Protons 11 12 13 14
    Electrons 10 10 10 10
    Size of isoelectronic cations decreases with increase in magnitude of nuclear charge \[\therefore \]  Order of decreasing size is \[N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]


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