Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ch-2021: NEET 2010 Chemistry - Class 12 AIPMT-2010-Ch-2021 Solution: The correct order of the decreasing ionic radii among the…

The correct order of the decreasing ionic radii among the following isoelectronic species is Ca2+>K+>S2−>Cl−Ca^{2+} > K^+ > S^{2-} > Cl^- Cl−>S2−>Ca2+>K+Cl^- > S^{2-} > Ca^{2+} > K^+ S2−>Cl−>K+>Ca2+S^{2-} > Cl^- > K^+ > Ca^{2+} K+>Ca2+>Cl−>S2−K^+ > Ca^{2+} > Cl^- > S^{2-}

Multiple Choice Options

  • A Fe 2+ , Ni 2+
  • B Zr 4+ , Ti 4+
  • C Zr 4+ , Hf 4+
  • D Zn 2+ , Hf 4+

Step-by-Step Verified Solution

Due to lanthanide contraction, the size of Zr and Hf (atom and ions) become nearly similar.

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