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JEE Main 202523 JanuaryMorning Shift
Exam
JEE Main
Year
2025
Date
23 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2025 · 23 January · Morning Shift · Chemistry · Coordination Compounds

The d- electronic configuration of an octahedral Co(II) complex...

The d- electronic configuration of an octahedral Co(II) complex having magnetic moment of 3.95 BM is:

Options

  1. At2 g3eg0\mathrm{t}_{2 \mathrm{~g}}{ }^3 \mathrm{e}_{\mathrm{g}}{ }^0
  2. Bt2 g6eg1\mathrm{t}_{2 \mathrm{~g}}{ }^6 \mathrm{e}_{\mathrm{g}}{ }^1
  3. Ct2 g5eg2\mathrm{t}_{2 \mathrm{~g}}{ }^5 \mathrm{e}_{\mathrm{g}}{ }^2
  4. De4t23\mathrm{e}^4 \mathrm{t}_2{ }^3

Correct answer

C. t2 g5eg2\mathrm{t}_{2 \mathrm{~g}}{ }^5 \mathrm{e}_{\mathrm{g}}{ }^2

Step-by-step solution

Co2+\mathrm{Co}^{2+} complex having μ=3.95BM\mu=3.95 \mathrm{BM} Hence number of unpaired electron =3=3 Co2+⇒3d7=t2 g5eg2\mathrm{Co}^{2+} \Rightarrow 3 d^7=\mathrm{t}_{2 \mathrm{~g}}^5 \mathrm{e}_{\mathrm{g}}^2
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