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JEE Main 20208 JanuaryMorning Shift
Exam
JEE Main
Year
2020
Date
8 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2020 · 8 January · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

The third ionization enthalpy is minimum for:

The third ionization enthalpy is minimum for:

Options

  1. ACoCo
  2. BFeFe
  3. CNiNi
  4. DMnMn

Correct answer

B. FeFe

Step-by-step solution

CO−[Ar]3d74s2CO - \left[Ar\right]3{d}^{7} 4{s}^{2}

Fe−[Ar]3d64s2Fe - \left[Ar\right]3{d}^{6} 4{s}^{2}

Ni−[Ar]3d84s2Ni - \left[Ar\right]3{d}^{8} 4{s}^{2}

Mn−[Ar]3d54s1Mn - \left[Ar\right]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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