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NEET 2007
Exam
NEET
Year
2007
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2007 · Chemistry · Classification of Elements and Periodicity in Properties

Identify the correct order of the size of the following:

Identify the correct order of the size of the following:

Options

  1. ACa2+<K+<Ar<Cl−<S2−\mathrm{Ca}^{2+} < \mathrm{K}^{+} < \mathrm{Ar} < \mathrm{Cl}^{-} < \mathrm{S}^{2-}
  2. BAr<Ca2+<K+Cl−<<S2−\mathrm{Ar} < \mathrm{Ca}^{2+} < \mathrm{K}^{+} \mathrm{Cl}^{-}< < \mathrm{S}^{2-}
  3. CCa2+<Ar<K+<Cl−<S2−\mathrm{Ca}^{2+} < \mathrm{Ar} < \mathrm{K}^{+} < \mathrm{Cl}^{-} < \mathrm{S}^{2-}
  4. DCa2+<K+<Ar<S2−<Cl−\mathrm{Ca}^{2+} < \mathrm{K}^{+} < \mathrm{Ar} < \mathrm{S}^{2-} < \mathrm{Cl}^{-}

Correct answer

A. Ca2+<K+<Ar<Cl−<S2−\mathrm{Ca}^{2+} < \mathrm{K}^{+} < \mathrm{Ar} < \mathrm{Cl}^{-} < \mathrm{S}^{2-}

Step-by-step solution

For isoelectronic species, size of anion increases as negative charge increases whereas size of cation decreases with increase in positive charge. Further ionic radii of anions is more than that of cations. Ca2+<K+<Ar<Cl−<S2−\mathrm{Ca}^{2+} < \mathrm{K}^{+} < \mathrm{Ar} < \mathrm{Cl}^{-} < \mathrm{S}^{2-}
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