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Geometry, hybridisation and magnetism of [NiCl4]2-, [Ni(CN)4]2- and Ni(CO)4

This type of question, asked 6 times: 2021 Paper 12, 28 Jun 2022, 31 Jan 2024, 21 Jan 2026 S1, 28 Jan 2026 S1, 6 Apr 2026 S2. All 6 questions below, oldest first.

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  1. Question 1

    2021 Paper 12

    28
    What is the difference in the number of unpaired electrons in [NiCl4]2−\left\lbrack NiCl_{4} \right\rbrack^{2 -} and [Ni(CN)4]2−\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}

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  2. Question 2

    28 Jun 2022

    39
    Given below are two statements: Statement I: [Ni(CN)4]2−\lbrack Ni(CN)_{4}\rbrack^{2 -} is a square planar and diamagnetic complex with dsp2dsp^{2} hybridization for NiNi but [Ni(CO)4]\left\lbrack Ni(CO)_{4} \right\rbrack is tetrahedral, paramagnetic and with sp3sp^{3}-hybridisation for NiNi. Statement II: [NiCl4]2−\left\lbrack NiCl_{4} \right\rbrack^{2 -} and [Ni(CO)4]\left\lbrack Ni(CO)_{4} \right\rbrack both have the same d-electron configuration, have the same geometry and are paramagnetic. In the light of the above statements, choose the correct answer from the options given below:

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  3. Question 3

    31 Jan 2024

    128
    Select the option with correct property -

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  4. Question 4

    21 Jan 2026 S1

    40
    Given below are two statements: Statement I: Among [Cu(NH3)4]2+,[Ni(en)3]2+\left\lbrack Cu\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +},\left\lbrack Ni(en)_{3} \right\rbrack^{2 +}, [Ni(NH3)6]2+\left\lbrack Ni\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} and [Mn(H2O)6]2+\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}, [Mn(H2O)6]2+\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +} has the maximum number of unpaired electrons. Statement II: The number of pairs among {[NiCl4]2−,[Ni(CO)4]},{[NiCl4]2−,[Ni(CN)4]2−}\left\{ \left\lbrack {NiCl}_{4} \right\rbrack^{2 -},\left\lbrack Ni(CO)_{4} \right\rbrack \right\},\left\{ \left\lbrack {NiCl}_{4} \right\rbrack^{2 -},\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} \right\} and {[Ni(CO)4], [Ni(CN)4]2−}\left\{ \left\lbrack Ni(CO)_{4} \right\rbrack,\ \left\lbrack Ni(CN)_{4} \right\rbrack^{2 -} \right\} that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer from the options given below:

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  5. Question 5

    28 Jan 2026 S1

    45
    The correct statement among the following is :

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  6. Question 6

    6 Apr 2026 S2

    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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