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QAIPMT-2003-Ch-2691: NEET 2003 Chemistry - Class 11 AIPMT-2003-Ch-2691 Solution: The ions \(O^{2-}\), \(F^-\), \(Na^+\), \(Mg^{2+}\) and…

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

Multiple Choice Options

  • A a significant increase from O2−O^{2-} to Al3+Al^{3+}
  • B a significant decrease from O2−O^{2-} to Al3+Al^{3+}
  • C an increase from O2−O^{2-} to F−F^- and then decrease from Na+Na^+ to Al3+Al^{3+}
  • D a decrease from O2−O^{2-} to F−F^- and then increase from Na+Na^+ to Al3+Al^{3+}.

Step-by-Step Verified Solution

Amongst isoelectronic ions, ionic radii of anions is more than that of cations. Further size of the anion increases with increase in -ve charge and size of cation decreases with increase in +ve charge. Hence, the correct order is O 2- > F - > Na + > Mg 2+ > Al 3+

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