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JEE Main 201412 AprilOnline
Exam
JEE Main
Year
2014
Date
12 April
Mode
Online
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2014 · 12 April · Online · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following arrangements represents the increasing order...

Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species O2−,S2−,N3−,P3−\mathrm{O}^{2-}, \mathrm{S}^{2-}, \mathrm{N}^{3-}, \mathrm{P}^{3-} ?

Options

  1. AO2−<N3−<S2−<P3−\mathrm{O}^{2-} < \mathrm{N}^{3-} < \mathrm{S}^{2-} < \mathrm{P}^{3-}
  2. BO2−<P3−<N3−<S2−\mathrm{O}^{2-} < \mathrm{P}^{3-} < \mathrm{N}^{3-} < \mathrm{S}^{2-}
  3. CN3<O2−<P3−<S2−\mathrm{N}^3 < \mathrm{O}^{2-} < \mathrm{P}^{3-} < \mathrm{S}^{2-}
  4. DN3−<S2−<O2−<P3−\mathrm{N}^{3-} < \mathrm{S}^{2-} < \mathrm{O}^{2-} < \mathrm{P}^{3-}

Correct answer

A. O2−<N3−<S2−<P3−\mathrm{O}^{2-} < \mathrm{N}^{3-} < \mathrm{S}^{2-} < \mathrm{P}^{3-}

Step-by-step solution

For isoelectronic species ionic radii decreases as the charge on ion decreases. Further on moving down in a group ionic radii increases. Hence the correct order is O2−<N3−<S2−<P3−\mathrm{O}^{2-} < \mathrm{N}^{3-} < \mathrm{S}^{2-} < \mathrm{P}^{3-}
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