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JEE Main2013ChemistryClassification of Elements and Periodicity in PropertiesActual

Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :

Options

  1. AHigh ionization enthalpy of fluorine
  2. BSmaller size of chlorine atom
  3. CSmaller size of fluorine atom
  4. DBigger size of 2 p orbital of fluorine

Correct answer

C. Smaller size of fluorine atom

Step-by-step solution

The electron gain enthalpy order for halogens is Cl > F > Br > I Due to small size of fluorine the extra electron to be added feels more electronelectron repulsion. Therefore fluorine has less value for electron affinity than chlorine.

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