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ChemistryJEE Main 22 Jan 2026, Shift 1·Q1·MCQ·Easy–moderate

Coordination Compounds · Low spin d electron configurations

Consider the transition metal ions MnX3+\ce{Mn^{3+}}, CrX3+\ce{Cr^{3+}}, FeX3+\ce{Fe^{3+}} and CoX3+\ce{Co^{3+}} and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is
  1. (1)CrX3+\ce{Cr^{3+}} >> FeX3+\ce{Fe^{3+}} >> CoX3+\ce{Co^{3+}} >> MnX3+\ce{Mn^{3+}}
  2. (2)MnX3+\ce{Mn^{3+}} >> FeX3+\ce{Fe^{3+}} >> CoX3+\ce{Co^{3+}} >> CrX3+\ce{Cr^{3+}}
  3. (3)FeX3+\ce{Fe^{3+}} >> CoX3+\ce{Co^{3+}} >> MnX3+\ce{Mn^{3+}} >> CrX3+\ce{Cr^{3+}}
  4. (4)CrX3+\ce{Cr^{3+}} >> MnX3+\ce{Mn^{3+}} >> FeX3+\ce{Fe^{3+}} >> CoX3+\ce{Co^{3+}}

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See the full 22 Jan 2026, Shift 1 paper