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Coordination Compounds

JEE Mains Chemistry. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 19 times: 4 in 2021, 3 in 2022, 4 in 2023, 4 in 2024, 2 in 2025, 2 in 2026. This one: 4 Apr 2026 S1 See all 19 of this type

    37
    Match List-I with List-II
    List-I Complex ionList-II Calculated spin only magnetic moment (BM)
    (A)
    [Cr(H2O)6]2+\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{2 +}
    		(I)3.87
    (B)
    [Co(H2O)6]2+\left\lbrack Co\left( H_{2}O \right)_{6} \right\rbrack^{2 +}
    		(II)5.92
    (C)
    [Cu(H2O)6]2+\left\lbrack Cu\left( H_{2}O \right)_{6} \right\rbrack^{2 +}
    		(III)4.90
    (D)
    [Mn(H2O)6]2+\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}
    		(IV)1.73
    Choose the correct answer from the options given below:

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  2. Question 2

    This type 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. This one: 24 Jan 2026 S1 See all 12 of this type

    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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  3. Question 3

    This type asked 10 times: 2021 Paper 14, 28 Jun 2022, 26 Jul 2022, 25 Jan 2023, 8 Apr 2023, 10 Apr 2023, 3 Apr 2025, 7 Apr 2025, 24 Jan 2026 S1, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 10 of this type

    46
    Number of paramagnetic complexes among the following is ____\_\_\_\_ . [MnBr4]2−\left\lbrack {MnBr}_{4} \right\rbrack^{2 -}, [NiCl4]2−\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}, [Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}, [Ni(CO)4]\left\lbrack Ni(CO)_{4} \right\rbrack, [CoF6]3−\left\lbrack {CoF}_{6} \right\rbrack^{3 -}, [Fe(CN)6]4−, [Mn(CN)6]3−, [Ti(CN)6]3−\lbrack Fe(CN)_{6}\rbrack^{4 -},\ \left\lbrack Mn(CN)_{6} \right\rbrack^{3 -},\ \left\lbrack Ti(CN)_{6} \right\rbrack^{3 -}, [Cu(H2O)6]2+,[Co(C2O4)3]3−\left\lbrack Cu\left( H_{2}O \right)_{6} \right\rbrack^{2 +},\left\lbrack Co\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -}

  4. Question 4

    This type asked 10 times: 2021 Paper 4, 27 Jun 2022, 29 Jan 2023, 8 Apr 2023, 10 Apr 2023, 13 Apr 2023, 27 Jan 2024, 5 Apr 2024, 4 Apr 2025, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 10 of this type

    44
    The correct increasing order of spin-only magnetic moment values of the complex ions [MnBr4]2−(A),[Cu(H2O)6]2+(B),[Ni(CN)4]2−(C)\left\lbrack MnBr_{4} \right\rbrack^{2 -}(A),\left\lbrack Cu\left( H_{2}O \right)_{6} \right\rbrack^{2 +}(B),\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}(C) and [Ni(H2O)6]2+(D)\left\lbrack Ni\left( H_{2}O \right)_{6} \right\rbrack^{2 +}(D) is:

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  5. Question 5

    This type asked 9 times: 2021 Paper 11, 25 Jul 2022, 11 Apr 2023, 6 Apr 2024, 3 Apr 2025, 23 Jan 2026 S1, 24 Jan 2026 S2, 2 Apr 2026 S1, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 9 of this type

    35
    Consider the metal complexes [Ni(en)3]2+(A)\left\lbrack Ni(en)_{3} \right\rbrack^{2 +}(A), [NiCl4]2−(B)\left\lbrack NiCl_{4} \right\rbrack^{2 -}(B) and [Ni(NH3)6]2+(C)\left\lbrack Ni\left( NH_{3} \right)_{6} \right\rbrack^{2 +}(C). Choose the CORRECT option by considering the number of unpaired electron present in (A), (B) and (C) respectively and the order of frequency of absorption.

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  6. Question 6

    This type 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. This one: 28 Jan 2026 S2 See all 9 of this type

    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 ____\_\_\_\_ .

  7. Question 7

    This type asked 9 times: 2021 Paper 16, 2021 Paper 19, 2021 Paper 26, 28 Jul 2022, 13 Apr 2023, 5 Apr 2024, 9 Apr 2024, 4 Apr 2025, 28 Jan 2026 S1. This one: 28 Jan 2026 S1 See all 9 of this type

    48
    X is the number of geometrical isomers exhibited by [Pt(NH3)(H2O)BrCl]\left\lbrack Pt\left( {NH}_{3} \right)\left( H_{2}O \right)BrCl \right\rbrack. Y is the number of optically inactive isomer(s) exhibited by [CrCl2(ox)2]3−\left\lbrack {CrCl}_{2}(ox)_{2} \right\rbrack^{3 -} Z is the number of geometrical isomers exhibited by [Co(NH3)3(NO2)3]\left\lbrack Co\left( {NH}_{3} \right)_{3}\left( {NO}_{2} \right)_{3} \right\rbrack The value of X+Y+ZX + Y + Z is ____\_\_\_\_ .

  8. Question 8

    This type asked 9 times: 2021 Paper 24, 27 Jun 2022, 29 Jul 2022, 10 Apr 2023, 12 Apr 2023, 22 Jan 2025, 2 Apr 2025, 4 Apr 2025, 21 Jan 2026 S2. This one: 21 Jan 2026 S2 See all 9 of this type

    38
    Given below are two statements: Statement I: Crystal Field Stabilization Energy (CFSE) of [Cr(H2O)6]2+\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{2 +} is greater than that of [Mn(H2O)6]2+\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}. Statement II: Potassium ferricyanide has a greater spin-only magnetic moment than sodium Ferrocyanide. In the light of the above statements, choose the correct answer from the options given below:

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  9. Question 9

    This type asked 6 times: 2021 Paper 12, 28 Jun 2022, 31 Jan 2024, 21 Jan 2026 S1, 28 Jan 2026 S1, 6 Apr 2026 S2. This one: 6 Apr 2026 S2 See all 6 of this type

    36
    Which of the following sequence of hybridization, geometry and magnetic nature are correct for the given coordination compounds ? (A) [NiCl4]2−−sp3\left\lbrack {NiCl}_{4} \right\rbrack^{2 -} - {sp}^{3}, tetrahedral, paramagnetic (B) [Ni(NH3)6]2+−sp3 d2\left\lbrack Ni\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} - {sp}^{3}{\text{ }d}^{2}, octahedral, paramagnetic (C) [Ni(CO)4]−sp3\left\lbrack Ni(CO)_{4} \right\rbrack - {sp}^{3}, tetrahedral, paramagnetic (D) [Ni(CN)4]2−−dsp2\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} - {dsp}^{2}, square planar diamagnetic Choose the correct answer from the options given below :

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  10. Question 10

    This type asked 5 times: 2021 Paper 14, 2021 Paper 17, 27 Jul 2022, 24 Jan 2023, 7 Apr 2025. This one: 7 Apr 2025 See all 5 of this type

    111
    Match List-I with List-II
    List-I ComplexList-II Primary valencyvalency and Secondary
    (A)
    [Co(en)2Cl2]Cl\left\lbrack Co(en)_{2}{Cl}_{2} \right\rbrack Cl
    		(I)36
    (B)
    [Pt(NH3)2Cl(NO2)]\left\lbrack Pt\left( {NH}_{3} \right)_{2}Cl\left( {NO}_{2} \right) \right\rbrack
    		(II)34
    (C)
    Hg[Co(SCN)4]Hg\left\lbrack Co(SCN)_{4} \right\rbrack
    		(III)26
    (D)
    [Mg( EDTA )]2−\lbrack Mg(\text{~EDTA~})\rbrack^{2 -}
    		(IV)24
    Choose the correct answer from the options given below:

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