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BITSAT 2013
Exam
BITSAT
Year
2013
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

BITSAT 2013 · Chemistry · Classification of Elements and Periodicity in Properties

The ions O^ 2- , F^ - , Na^ + , Mg^ 2+ and Al^ 3+ are...

The ions O2−,F−,Na+,Mg2+\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+} and Al3+\mathrm{Al}^{3+} are isoelectronic. Their ionic radii show:

Options

  1. AA decrease from O2−\mathrm{O}^{2-} to F−\mathrm{F}^{-} and then increase from Na+\mathrm{Na}^{+} to Al3+\mathrm{Al}^{3+}
  2. BA significant increase from O2−\mathrm{O}^{2-} to Al3+\mathrm{Al}^{3+}
  3. CA significant decrease from O2−\mathrm{O}^{2-} to Al3+\mathrm{Al}^{3+}
  4. DAn increase from O2−\mathrm{O}^{2-} to F−\mathrm{F}^{-} and then decrease from Na+\mathrm{Na}^{+} to Al3+\mathrm{Al}^{3+}

Correct answer

C. A significant decrease from O2−\mathrm{O}^{2-} to Al3+\mathrm{Al}^{3+}

Step-by-step solution

Amongst isoelectronic species, ionic radii of anion is more than that of cations. Further size of anion increase with increase in -ve charge and size of cation decrease with increase in ++ ve charge. Hence ionic radii decreases from O−\mathrm{O}^{-} to Al3+\mathrm{Al}^{3+}
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