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AP EAMCET202021 Sep 2020Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Find the correct order of the given elements with respect to their size

Options

  1. A( Zn > Fe > Fe ²⁺> Fe ³⁺ )
  2. B( Fe ²⁺> Fe ²⁺> Zn > Fe )
  3. C( Fe > Fe ²⁺> Fe ³⁺> Zn )
  4. D( Zn > Fe ³⁺> Fe ²⁺> Fe )

Correct answer

A. ( Zn > Fe > Fe ²⁺> Fe ³⁺ )

Step-by-step solution

( Zn ) atomic radii is (137 pm ) ( Fe ) atomic radii is (126 pm ) ( Fe ³⁺ ) ionic radius is (63 pm ), ( Fe ²⁺ ) has an ionic radius of (77 pm ). Thus, the correct order of their size is ( Zn > Fe > Fe ²⁺ > Fe ³⁺ ) Hence, the correct option is (a).

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