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t2g and eg electron configuration of a given octahedral complex

This type of question, asked 9 times: 26 Jun 2022, 10 Apr 2023, 15 Apr 2023, 31 Jan 2024, 4 Apr 2024, 8 Apr 2024, 23 Jan 2025, 2 Apr 2025, 28 Jan 2026 S2. All 9 questions below, oldest first.

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  1. Question 1

    26 Jun 2022

    149
    Reaction of [Co(H2O)6]2+\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{2 +} with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in t2 gt_{2\text{ }g}-orbitals of the product is

  2. Question 2

    10 Apr 2023

    58
    In potassium ferrocyanide, there are ____pairs of electrons in the t2 gt_{2\text{ }g} set of orbitals

  3. Question 3

    15 Apr 2023

    51
    The homoleptic and octahedral complex of Co2+Co^{2 +} and H2OH_{2}O has____ unpaired electron(s) in the t2gt_{2g} set of orbitals.

  4. Question 4

    31 Jan 2024

    121
    Match List I with List II
    List I (Complex ion)List II (Electronic configuration)
    A.
    [Cr(H2O)6]3+\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{3 +}
    		I.
    t2g2eg0t_{2g}^{2}e_{g}^{0}
    B.
    [Fe(H2O)6]3+\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{3 +}
    		II.
    t2g3eg0t_{2g}^{3}e_{g}^{0}
    C.
    [Ni(H2O)6]2+\left\lbrack Ni\left( H_{2}O \right)_{6} \right\rbrack^{2 +}
    		III.
    t2g3eg2t_{2g}^{3}e_{g}^{2}
    D.
    [V(H2O)6]3+\left\lbrack V\left( H_{2}O \right)_{6} \right\rbrack^{3 +}
    		IV.
    t2g6eg2t_{2g}^{6}e_{g}^{2}
    Choose the correct answer from the options given below:

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  5. Question 5

    4 Apr 2024

    132
    If an iron (III) complex with the formula [Fe(NH3)x(CN)y]−\left\lbrack Fe\left( NH_{3} \right)_{x}(CN)_{y} \right\rbrack^{-}has no electron in its ege_{g} orbital, then the value of x+yx + y is

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  6. Question 6

    8 Apr 2024

    49
    Number of complexes with even number of electrons in t2 gt_{2\text{ }g} orbitals is - [Fe(H2O)6]2+,[Co(H2O)6]2+,[Co(H2O)6]3+\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{3 +},
    [Cu(H2O)6]2+,[Cr(H2O)6]2+\left\lbrack Cu\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{2 +}

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  7. Question 7

    23 Jan 2025

    35
    The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is :

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  8. Question 8

    2 Apr 2025

    46
    A transition metal (M) among Mn,Cr,CoMn,Cr,Co and Fe has the highest standard electrode potential (M3+/M2+)\left( M^{3 +}/M^{2 +} \right). It forms a metal complex of the type [M(CN)6]4−\left\lbrack M(CN)_{6} \right\rbrack^{4 -}. The number of electrons present in the ege_{g} orbital of the complex is ____ .

  9. Question 9

    28 Jan 2026 S2

    50
    The number of isoelectronic species among Sc3+{Sc}^{3 +}, Cr2+,Mn3+,Co3+{Cr}^{2 +},{Mn}^{3 +},{Co}^{3 +} and Fe3+{Fe}^{3 +} is ' n '. If ' n ' moles of AgCl is formed during the reaction of complex with formula CoCl3(en)2NH3{CoCl}_{3}(en)_{2}{NH}_{3} with excess of AgNO3{AgNO}_{3} solution, then the number of electrons present in the t2gt_{2g} orbitals of the complex is ____\_\_\_\_ .