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JEE Main20208 Jan 2020Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The third ionization enthalpy is minimum for:

Options

  1. AC o
  2. BF e
  3. CN i
  4. DM n

Correct answer

B. F e

Step-by-step solution

C O − A r 3 d 7 4 s 2 F e − A r 3 d 6 4 s 2 N i − A r 3 d 8 4 s 2 M n − A r 3 d 5 4 s 1 In Fe third electron will remove from 3d and extra stability will be attained by this so ionisation energy is minimum for Fe.

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