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Question

Ionic radii of :
  1. Ti4+<Mn7+
  2. 35Cl<37Cl
  3. K+>Cl
  4. P3+>P5+


Solution

The correct option is D P3+>P5+
Larger the positive charge on the ion smaller will be the size of ion for the same element. 
For P3+, there are 15 protons for 12 electrons while for P5+ there are 15 protons for 10 electrons. Thus, in P5+ the valence electrons are more strongly attracted by the nucleus than those of P3+. As a result, there is a larger contraction in the size of P5+ than that of P3+ Hence, P3+ is bigger than P5+.

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