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Unpaired electrons for d^n ions in high-spin or low-spin octahedral complexes

This type of question, asked 3 times: 21 Jan 2026 S2, 22 Jan 2026 S1, 5 Apr 2026 S2. All 3 questions below, oldest first.

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  1. Question 1

    21 Jan 2026 S2

    49
    Identify the metal ions among Co2+,Ni2+,Fe2+,V3+{Co}^{2 +},{Ni}^{2 +},{Fe}^{2 +},V^{3 +} and Ti2+{Ti}^{2 +} having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is____\_\_\_\_ .

  2. Question 2

    22 Jan 2026 S1

    26
    Consider the transition metal ions Mn3+,Cr3+,Fe3+Mn^{3 +},Cr^{3 +},Fe^{3 +} and Co3+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

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  3. Question 3

    5 Apr 2026 S2

    46
    The total number of unpaired electrons present in the d3, d4d^{3},{\text{ }d}^{4} (low spin) d5d^{5} (high spin), d6d^{6} (high spin) and d7d^{7} (low spin) octahedral complex systems is ____\_\_\_\_ .