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JEE Main201815 Apr 2018Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of electron affinity is:

Options

  1. AO > F > Cl
  2. BF > O > Cl
  3. CF > Cl > O
  4. DCl > F > O

Correct answer

D. Cl > F > O

Step-by-step solution

On moving from left to right across a period, the electron affinity becomes more negative. On moving from top to bottom in a group, the electron affinity becomes less negative. Chlorine has more negative electron affinity than fluorine, Because adding an electron to fluorine ( 2 p orbital) causes greater repulsion than adding an electron to chlorine (3 p orbital) which is larger in size.

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