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JEE Main 201815 AprilMorning ShiftOnline
Exam
JEE Main
Year
2018
Date
15 April
Shift
Morning Shift
Mode
Online
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2018 · 15 April · Morning Shift · Online · Chemistry · Classification of Elements and Periodicity in Properties

For Na^ + , Mg^ 2+ , F^ - and O^ 2- ; the correct order of...

For Na+,Mg2+,F−\mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{F}^{-}and O2−\mathrm{O}^{2-}; the correct order of increasing Ionic radii is :

Options

  1. AO2−<F−<Na+<Mg2+\mathrm{O}^{2-} < \mathrm{F}^{-} < \mathrm{Na}^{+} < \mathrm{Mg}^{2+}
  2. BNa+<Mg2+<F−<O2−\mathrm{Na}^{+} < \mathrm{Mg}^{2+} < \mathrm{F}^{-} < \mathrm{O}^{2-}
  3. CMg2+<Na+<F−<O2−\mathrm{Mg}^{2+} < \mathrm{Na}^{+} < \mathrm{F}^{-} < \mathrm{O}^{2-}
  4. DMg2+<O2−<Na+<F−\mathrm{Mg}^{2+} < \mathrm{O}^{2-} < \mathrm{Na}^{+} < \mathrm{F}^{-}

Correct answer

C. Mg2+<Na+<F−<O2−\mathrm{Mg}^{2+} < \mathrm{Na}^{+} < \mathrm{F}^{-} < \mathrm{O}^{2-}

Step-by-step solution

All species are isoelectronic (10e−)\left(10 \mathrm{e}^{-}\right). isoelectronic series, when negative charge increases the radius of ion increases. ∴Mg2+<Na+<F−<O2−\therefore \mathrm{Mg}^{2+} < \mathrm{Na}^{+} < \mathrm{F}^{-} < \mathrm{O}^{2-}
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