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BITSAT 2011
Exam
BITSAT
Year
2011
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

BITSAT 2011 · Chemistry · Classification of Elements and Periodicity in Properties

The correct order of radii is

The correct order of radii is

Options

  1. AN<Be<B\quad \mathrm{N}< \mathrm{Be}< \mathrm{B}
  2. BF−<O2−<N3−\mathrm{F}^{-}< \mathrm{O}^{2-}< \mathrm{N}^{3-}
  3. CNa<L1<K\quad \mathrm{Na}< \mathrm{L}_{1}< \mathrm{K}
  4. DFe3+<Fe2+<Fe4+\mathrm{Fe}^{3+}< \mathrm{Fe}^{2+}< \mathrm{Fe}^{4+}

Correct answer

B. F−<O2−<N3−\mathrm{F}^{-}< \mathrm{O}^{2-}< \mathrm{N}^{3-}

Step-by-step solution

Effective nuclear charge (i,e. Z/e ratio) decreases from F−\mathrm{F}^{-} to N3−\mathrm{N}^{3-} hence the radii follows the order: F−<O2−<N3−.Z/e\mathrm{F}^{-}< \mathrm{O}^{2-}< \mathrm{N}^{3-}. \mathrm{Z} / \mathrm{e} for F−=9/10=0.9,\mathrm{F}^{-}=9 / 10=0.9, for O2−=8/10=.8,\mathrm{O}^{2-}=8 / 10=.8, for N3−=0.7\mathrm{N}^{3-}=0.7
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