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Hybridisation and magnetic nature of a given complex (valence bond theory)

This type of question, asked 12 times: 2021 Paper 3, 2021 Paper 17, 24 Jan 2023, 30 Jan 2023, 27 Jan 2024, 1 Feb 2024, 9 Apr 2024, 28 Jan 2025, 29 Jan 2025, 2 Apr 2025, 23 Jan 2026 S2, 24 Jan 2026 S1. All 12 questions below, oldest first.

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  1. Question 1

    2021 Paper 3

    47
    The hybridization and magnetic nature of [Mn(CN)6]4−\left\lbrack Mn(CN)_{6} \right\rbrack^{4 -} and [Fe(CN)6]3−\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -}, respectively are:

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  2. Question 2

    2021 Paper 17

    38
    Given below are two statements: Statement I : [Mn(CN)6]3−,[Fe(CN)6]3−\left\lbrack Mn(CN)_{6} \right\rbrack^{3 -},\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -} and [Co(C2O4)3]3−\left\lbrack Co\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} are d2sp3d^{2}sp^{3} hybridised. Statement II: [MnCl6]3−\left\lbrack MnCl_{6} \right\rbrack^{3 -} and [FeF6]3−\left\lbrack FeF_{6} \right\rbrack^{3 -} are paramagnetic and have 4 and 5 unpaired electrons, respectively. In the light of the above statements, choose the correct answer from the options given below:

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  3. Question 3

    24 Jan 2023

    126
    The hybridization and magnetic behaviour of cobalt ion in [Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +} complex, respectively is

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  4. Question 4

    30 Jan 2023

    135
    Match List I with List II:
    List I (Complexes)List II (Hybridisation)
    A.[Ni(CO)4]\left\lbrack Ni(CO)_{4} \right\rbrackI.sp3sp^{3}
    B.[Cu(NH3)4]2+\left\lbrack Cu\left( NH_{3} \right)_{4} \right\rbrack^{2 +}II.dsp2dsp^{2}
    C.[Fe(NH3)6]2+\left\lbrack Fe\left( NH_{3} \right)_{6} \right\rbrack^{2 +}III.sp3d2sp^{3}d^{2}
    D.[Fe(H2O)6]2+\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{2 +}IV.d2sp3d^{2}sp^{3}

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  5. Question 5

    27 Jan 2024

    134
    Identify from the following species in which d2sp3d^{2}sp^{3} hybridization is shown by central atom:

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  6. Question 6

    1 Feb 2024

    136
    [Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +} and [CoF6]3−\left\lbrack CoF_{6} \right\rbrack^{3 -} are respectively known as:

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  7. Question 7

    9 Apr 2024

    127
    Match List I with List II
    LIST-ILIST-II
    A.
    K2[Ni(CN)4]K_{2}\left\lbrack Ni(CN)_{4} \right\rbrack
    		I.
    sp3sp^{3}
    B.
    [Ni(CO)4]\left\lbrack Ni(CO)_{4} \right\rbrack
    		II.
    sp3 d2sp^{3}{\text{ }d}^{2}
    C.
    [Co(NH3)6]Cl3\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack Cl_{3}
    		III.
    dsp2dsp^{2}
    D.
    Na3[CoF6]Na_{3}\left\lbrack CoF_{6} \right\rbrack
    		IV.
    d2sp3d^{2}sp^{3}
    Choose the correct answer from the options given below:

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  8. Question 8

    28 Jan 2025

    111
    Match List-I with List-II.
    List-I (Complex)List-II (Hybridisation of central metal ion)
    (A)[CoF6]3−\left\lbrack CoF_{6} \right\rbrack^{3 -}(I) d2sp3d^{2}sp^{3}
    (B)[NiCl4]2−\left\lbrack NiCl_{4} \right\rbrack^{2 -}(II) sp3sp^{3}
    (C)[Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +}(III) sp3 d2sp^{3}\text{ }d^{2}
    (D)[Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}(IV) dsp2dsp^{2}
    Choose the correct answer from the options given below :

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  9. Question 9

    29 Jan 2025

    33
    Match List-I with List-II.
    List-I (Complex)List-II (Hybridisation and magnetic character)
    (A) [MnBr4]2−[MnBr_{4}]^{2-}(I) d2sp3d^{2}sp^{3}, diamagnetic
    (B) [FeF6]3−[FeF_{6}]^{3-}(II) sp3d2sp^{3}d^{2}, paramagnetic
    (C) [Co(C2O4)3]3−[Co(C_{2}O_{4})_{3}]^{3-}(III) sp3sp^{3}, diamagnetic
    (D) [Ni(CO)4][Ni(CO)_{4}](IV) sp3sp^{3}, paramagnetic
    Choose the correct answer from the options given below :

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  10. Question 10

    2 Apr 2025

    108
    The type of hybridization and the magnetic property of [MnCl6]3−\left\lbrack MnCl_{6} \right\rbrack^{3 -} are :

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  11. Question 11

    23 Jan 2026 S2

    30
    Identify the CORRECT set of details from the following : (A) [Co(NH3)6]3+\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +} : Inner orbital complex ; d2d^{2} sp3{sp}^{3} hybridized (B) [MnCl6]3−\left\lbrack {MnCl}_{6} \right\rbrack^{3 -} : Outer orbital complex; sp3d2{sp}^{3}{d}^{2} hybridized (C) [CoF6]3−\left\lbrack {CoF}_{6} \right\rbrack^{3 -} : Outer orbital complex ; d2sp3d^{2}{sp}^{3} hybridized (D) [FeF6]3−\left\lbrack {FeF}_{6} \right\rbrack^{3 -} : Outer orbital complex: sp3 d2{sp}^{3}{\text{ }d}^{2} hybridized (E) [Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} : Inner orbital complex ; sp3{sp}^{3} hybridized Choose the correct answer from the options given below:

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  12. Question 12

    24 Jan 2026 S1

    26
    Given below are two statements : Statement-I Hybridisation, shape and spin only magnetic moment of K3[Co(CO3)3]K_{3}\left\lbrack Co\left( {CO}_{3} \right)_{3} \right\rbrack is sp3 d2{sp}^{3}{\text{ }d}^{2}, octahedral and 4.9 BM respectively. Statement-II Geometry, hybridisation and spin only magnetic moment values (BM) of the ions [Ni(CN)4]2−,[MnBr4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -},\left\lbrack {MnBr}_{4} \right\rbrack^{2 -} and [CoF6]3−\left\lbrack {CoF}_{6} \right\rbrack^{3 -} respectively are square planar, tetrahedral, octahedral : dsp2,sp3{dsp}^{2},{sp}^{3}, sp3 d2{sp}^{3}{\text{ }d}^{2} and 0, 5.9, 4.9. In the light of the above statements, choose the correct answer from the options given below

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