Coordination Compounds · JEE Main previous year questions

2026 26 questions

1. Q712026 · 8 Apr 2026 · Shift 2· Numerical answer

   Number of paramagnetic complexes among the following is ____. $[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}$, $[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-}$, $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$, $[\mathrm{Ni}(\mathrm{CO}{)}_4]$, $[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}$, $[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{4-}$, $[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}$, $[\mathrm{Ti}(\mathrm{CN}{)}_6{]}^{3-}$, $[\mathrm{Cu}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$, $[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$

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   Answer: 6

2. Q612026 · 6 Apr 2026 · Shift 1

   Match the LIST-I with LIST-II $$\begin{array}{llll}\text{List-I}& & \text{List-II}& \\ \text{Electronic configuration of}& & \text{Crystal Field Stabilization}& \\ \text{tetrahedral metal ion}& & \text{Energy }({\Delta }_{\mathrm{t}})& \\ \text{A.}& {\mathrm{d}}^2& \text{I.}& -0.6\\ \text{B.}& {\mathrm{d}}^4& \text{II.}& -0.8\\ \text{C.}& {\mathrm{d}}^6& \text{III.}& -1.2\\ \text{D.}& {\mathrm{d}}^8& \text{IV.}& -0.4\end{array}$$ Choose the correct answer from the options given below:

   1. A.A-III, B-IV, C-II, D-I
   2. B.A-III, B-I, C-IV, D-II
   3. C.A-III, B-IV, C-I, D-II
   4. D.A-II, B-I, C-IV, D-III
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   Answer: C

3. Q612026 · 6 Apr 2026 · Shift 2

   Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A. $[{\text{NiCl}}_4{]}^{2-}-{\text{sp}}^3$, tetrahedral, paramagnetic B. $[\text{Ni}({\text{NH}}_3{)}_6{]}^{2+}-{\text{sp}}^3{\text{d}}^2$, octahedral, paramagnetic C. $[\text{Ni}(\text{CO}{)}_4]-{\text{sp}}^3$, tetrahedral, paramagnetic D. $[\text{Ni}(\text{CN}{)}_4{]}^{2-}-{\text{dsp}}^2$, square planar, diamagnetic Choose the correct answer from the options given below :

   1. A.A, B, C and D
   2. B.B, C and D only
   3. C.A, C and D only
   4. D.A, B and D only
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   Answer: D

4. Q612026 · 5 Apr 2026 · Shift 1

   The correct statements about metal carbonyls are A. The metal-carbon bonds in metal carbonyls possess both $\sigma$ and $\pi$-character. B. Due to synergic bonding interactions between metal and $\text{CO}$ ligand, the metal-carbon bond becomes weak. C. The metal-carbon $\sigma$ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal. D. The metal-carbon $\pi$ bond is formed by the donation of electrons from filled d-orbital of metal into vacant ${\pi }^{\ast }$ orbital of $\text{CO}$. Choose the correct answer from the options given below:

   1. A.A and B Only
   2. B.A, C and D Only
   3. C.B and C Only
   4. D.A and D Only
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   Answer: B

5. Q622026 · 5 Apr 2026 · Shift 1

   Given below are two statements: Statement I: Each electron in ${\text{e}}_{\text{g}}$ orbitals destabilizes the orbitals by $+0.6{\Delta }_{\text{o}}$ and each electron in the ${\text{t}}_{2\text{g}}$ orbitals stabilizes the orbitals by $-0.4{\Delta }_{\text{o}}$ in an octahedral field on the basis of crystal field theory. Statement II: All the d - orbitals of the transition metals have the same energy in their free atomic state but when a complex is formed the ligands destroy the degeneracy of these orbitals on the basis of crystal field theory. In the light of the above statements, choose the correct answer from the options given below

   1. A.Both Statement I and Statement II are correct
   2. B.Both Statement I and Statement II are incorrect
   3. C.Statement I is correct but Statement II is incorrect
   4. D.Statement I is incorrect but Statement II is correct
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   Answer: A

6. Q582026 · 5 Apr 2026 · Shift 2

   Given below are two statements : Statement I : The number of pairs among $[\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3,\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3]$, $[\mathrm{C}{\mathrm{l}}_2{\mathrm{O}}_7,\mathrm{M}{\mathrm{n}}_2{\mathrm{O}}_7]$, $[\mathrm{N}{\mathrm{a}}_2\mathrm{O},{\mathrm{V}}_2{\mathrm{O}}_3]$ and $[\mathrm{CO},{\mathrm{N}}_2\mathrm{O}]$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is $4$. Statement II : Among $\mathrm{N}{\mathrm{a}}_2\mathrm{O}$, $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$, $\mathrm{CO}$ and $\mathrm{C}{\mathrm{l}}_2{\mathrm{O}}_7$, the most basic and acidic oxides are $\mathrm{N}{\mathrm{a}}_2\mathrm{O}$ and $\mathrm{C}{\mathrm{l}}_2{\mathrm{O}}_7$, respectively. In the light of the above statements, choose the $\underline{\text{correct}}$ answer from the options given below :

   1. A.Both Statement I and Statement II are true
   2. B.Both Statement I and Statement II are false
   3. C.Statement I is true but Statement II is false
   4. D.Statement I is false but Statement II is true
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   Answer: A

7. Q602026 · 5 Apr 2026 · Shift 2

   Given below are two statements : Statement I : Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement II : $d_{xy}=d_{xz}=d_{yz}<d_{x^2-y^2}=d_{z^2}$ and $d_{x^2-y^2}=d_{z^2}<d_{xy}=d_{xz}=d_{yz}$ are the d-orbital splittings in $[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}$ and $[\mathrm{Ni}(\mathrm{Cl}{)}_4{]}^{2-}$ complex ions respectively. In the light of the above statements, choose the $\underline{\text{correct}}$ answer from the options given below :

   1. A.Both Statement I and Statement II are correct
   2. B.Both Statement I and Statement II are incorrect
   3. C.Statement I is correct but Statement II is incorrect
   4. D.Statement I is incorrect but Statement II is correct
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   Answer: A

8. Q612026 · 5 Apr 2026 · Shift 2

   Identify the $\underline{\text{correct}}$ statements from the following A. $[\mathrm{Fe}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$ is the most stable complex among $[\mathrm{Fe}(\mathrm{OH}{)}_6{]}^{3-}$, $[\mathrm{Fe}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$ and $[\mathrm{Fe}(\mathrm{SCN}{)}_6{]}^{3-}$ B. The stability of $[\mathrm{Cu}(\mathrm{N}{\mathrm{H}}_3{)}_4{]}^{2+}$ is greater than that of $[\mathrm{Cu}(\mathrm{en}{)}_2{]}^{2+}$ C. The hybridization of $\mathrm{Fe}$ in ${\mathrm{K}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6]$ is ${\mathrm{d}}^2\mathrm{s}{\mathrm{p}}^3$ D. $[\mathrm{Fe}(\mathrm{N}{\mathrm{O}}_2{)}_3\mathrm{C}{\mathrm{l}}_3{]}^{3-}$ exhibits linkage isomerism E. $\mathrm{N}{\mathrm{O}}_2^{-}$ and $\mathrm{SC}{\mathrm{N}}^{-}$ ligands are NOT ambidentate ligands Choose the $\underline{\text{correct}}$ answer from the options given below :

   1. A.A, B, C, D and E
   2. B.B, C and D only
   3. C.A, C and D only
   4. D.A, C and E only
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   Answer: C

9. Q712026 · 5 Apr 2026 · Shift 2· Numerical answer

   The total number of unpaired electrons present in the ${\mathrm{d}}^3$, ${\mathrm{d}}^4$ (low spin) ${\mathrm{d}}^5$ (high spin), ${\mathrm{d}}^6$ (high spin) and ${\mathrm{d}}^7$ (low spin) octahedral complex systems is ____.

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   Answer: 15

10. Q622026 · 4 Apr 2026 · Shift 1

    Match the LIST-I with LIST-II $$\begin{array}{llll}& \text{List-I}& & \text{List-II}\\ & \text{Complex ion}& & \text{Calculated spin only magnetic moment (BM)}\\ \text{A.}& [\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}& \text{I.}& 3.87\\ \text{B.}& [\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}& \text{II.}& 5.92\\ \text{C.}& [\mathrm{Cu}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}& \text{III.}& 4.90\\ \text{D.}& [\mathrm{Mn}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}& \text{IV.}& 1.73\end{array}$$ Choose the correct answer from the options given below:

    1. A.A-I, B-III, C-IV, D-II
    2. B.A-II, B-I, C-III, D-IV
    3. C.A-IV, B-II, C-I, D-III
    4. D.A-III, B-I, C-IV, D-II
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    Answer: D

11. Q542026 · 4 Apr 2026 · Shift 2
    
    1. A.Blue color is formed on both sides.
    2. B.Ionic solutes in aqueous solution can pass through semi-permeable membrane.
    3. C.Solution on side 'y' is hypotonic.
    4. D.To cause the reverse flow of solvent during osmosis, external pressure (any value) should be applied to side 'x'.
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    Answer: C

12. Q602026 · 4 Apr 2026 · Shift 2

    Consider the metal complexes $[\mathrm{Ni}(\mathrm{en}{)}_3{]}^{2+}$ (A), $[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-}$ (B) and $[\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{2+}$(C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.

    1. A.2, 2, 2 and (A) > (C) > (B)
    2. B.0, 2, 0 and (A) > (C) > (B)
    3. C.2, 2, 0 and (B) > (C) > (A)
    4. D.2, 2, 2 and (C) > (A) > (B)
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    Answer: A

13. Q602026 · 2 Apr 2026 · Shift 2

    Given below are two statements : Statement I : Among Zn, Mn, Sc and Cu, the energy required to remove the third valence electron is highest for Zn and lowest for Sc. Statement II : The correct order of the following complexes in terms of CFSE is $[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}<[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}<[\mathrm{Co}(\mathrm{en}{)}_3{]}^{3+}$. In the light of the above statements, choose the correct answer from the options given below :

    1. A.Both Statement I and Statement II are true
    2. B.Both Statement I and Statement II are false
    3. C.Statement I is true but Statement II is false
    4. D.Statement I is false but Statement II is true
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    Answer: A

14. Q612026 · 2 Apr 2026 · Shift 2

    Which of the following complexes will show coordination isomerism ? A. $[\mathrm{Ag}(\mathrm{N}{\mathrm{H}}_3{)}_2][\mathrm{Ag}(\mathrm{CN}{)}_2]$ B. $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6][\mathrm{Cr}(\mathrm{CN}{)}_6]$ C. $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6][\mathrm{Co}(\mathrm{CN}{)}_6]$ D. $[\mathrm{Fe}(\mathrm{N}{\mathrm{H}}_3{)}_6][\mathrm{Co}(\mathrm{CN}{)}_6]$ E. $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6][\mathrm{Fe}(\mathrm{CN}{)}_6]$ Choose the correct answer from the options given below :

    1. A.B, C and D Only
    2. B.B, D and E Only
    3. C.A, C and D Only
    4. D.C, D and E Only
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    Answer: B

15. Q642026 · 28 Jan 2026 · Shift 2

    The correct increasing order of spin-only magnetic moment values of the complex ions $[{\text{MnBr}}_4{]}^{2-}$ (A), $[\text{Cu}({\text{H}}_2\text{O}{)}_6{]}^{2+}$ (B), $[\text{Ni}(\text{CN}{)}_4{]}^{2-}$ (C) and $[\text{Ni}({\text{H}}_2\text{O}{)}_6{]}^{2+}$ (D) is :

    1. A.$\text{A}=\text{B}<\text{D}<\text{C}$
    2. B.$\text{C}=\text{D}<\text{B}<\text{A}$
    3. C.$\text{C}<\text{B}<\text{D}<\text{A}$
    4. D.$\text{A}=\text{B}<\text{C}<\text{D}$
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    Answer: C

16. Q552026 · 24 Jan 2026 · Shift 1

    Given below are two statements : Statement I : Hybridisation, shape and spin only magnetic moment of ${\mathrm{K}}_3[\mathrm{Co}(\mathrm{C}{\mathrm{O}}_3{)}_3]$ is $\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^2$, octahedral and $4.9\mathrm{BM}$ respectively. Statement II : Geometry, hybridisation and spin only magnetic moment values $(BM)$ of the ions $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$, $[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}$ and $[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}$ respectively are square planar, tetrahedral, octahedral; $\mathrm{ds}{\mathrm{p}}^2$, $\mathrm{s}{\mathrm{p}}^3$, $\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^2$ and $0,5.9,4.9$. In the light of the above statements, choose the correct answer from the options given below

    1. A.Both Statement I and Statement II are false
    2. B.Statement I is true but Statement II is false
    3. C.Both Statement I and Statement II are true
    4. D.Statement I is false but Statement II is true
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    Answer: D

17. Q572026 · 24 Jan 2026 · Shift 1

    Given below are two statements: Statement I : The number of paramagnetic species among $[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}$, $[\mathrm{Ti}{\mathrm{F}}_6{]}^{3-}$, ${\mathrm{V}}_2{\mathrm{O}}_5$ and $[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-}$ is $3$ . Statement II : ${\mathrm{K}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6]<{\mathrm{K}}_3[\mathrm{Fe}(\mathrm{CN}{)}_6]<[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6]\mathrm{S}{\mathrm{O}}_4\cdot {\mathrm{H}}_2\mathrm{O}<[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6]\mathrm{C}{\mathrm{l}}_3$ is the correct order in terms of number of unpaired electron(s) present in the complexes. In the light of the above statements, choose the correct answer from the options given below

    1. A.Statement I is true but Statement II is false
    2. B.Both Statement I and Statement II are false
    3. C.Statement I is false but Statement II is true
    4. D.Both Statement I and Statement II are true
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    Answer: D

18. Q592026 · 24 Jan 2026 · Shift 1

    Among the following, the CORRECT combinations are A. $\mathrm{I}{\mathrm{F}}_3\to \text{T-shaped}(\mathrm{s}{\mathrm{p}}^3\mathrm{d})$ B. $\mathrm{I}{\mathrm{F}}_5\to \text{Square pyramidal}(\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^2)$ C. $\mathrm{I}{\mathrm{F}}_7\to \text{Pentagonal bipyramidal}(\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^3)$ D. $\mathrm{Cl}{\mathrm{O}}_4^{-}\to \text{Square planar}(\mathrm{s}{\mathrm{p}}^2\mathrm{d})$ Choose the correct answer from the options given below:

    1. A.B, C and D Only
    2. B.A, B, C and D
    3. C.A, B and C Only
    4. D.A and B Only
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    Answer: C

19. Q612026 · 24 Jan 2026 · Shift 1

    Consider a mixture ' X ' which is made by dissolving $0.4\mathrm{mol}$ of $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_5\mathrm{S}{\mathrm{O}}_4]\mathrm{Br}$ and $0.4\mathrm{mol}$ of $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_5\mathrm{Br}]\mathrm{S}{\mathrm{O}}_4$ in water to make $4\mathrm{L}$ of solution. When $2\mathrm{L}$ of mixture ' X ' is allowed to react with excess of $\mathrm{AgN}{\mathrm{O}}_3$, it forms precipitate ' Y '. The rest $2\mathrm{L}$ of mixture ' X ' reacts with excess $\mathrm{BaC}{\mathrm{l}}_2$ to form precipitate ' Z '. Which of the following statements is CORRECT?

    1. A.$0.1\mathrm{mol}$ of ' $Y$ ' is formed.
    2. B.$0.4\mathrm{mol}$ of ' $Z$ ' is formed.
    3. C.$0.2\mathrm{mol}$ of ' $Z$ ' is formed.
    4. D.' Y ' is $\mathrm{BaS}{\mathrm{O}}_4$ and ' Z ' is $\mathrm{AgBr}$ .
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    Answer: C

20. Q712026 · 23 Jan 2026 · Shift 1· Numerical answer

    The crystal field splitting energy of $[\mathrm{Co}(\text{ oxalate }{)}_3{]}^{3-}$ complex is ' $n$ ' times that of the $[\mathrm{Cr}(\text{ oxalate }{)}_3{]}^{3-}$ complex. Here ' $n$ ' is ____ . (Assume ${\Delta }_0\gg P$ )

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    Answer: 2

21. Q692026 · 23 Jan 2026 · Shift 2

    Identify the CORRECT set of details from the following : A. $[\text{Co}({\text{NH}}_3{)}_6{]}^{3+}$ : Inner orbital complex; ${\text{d}}^2{\text{sp}}^3$ hybridized B. $[{\text{MnCl}}_6{]}^{3-}$ : Outer orbital complex; ${\text{sp}}^3{\text{ d}}^2$ hybridized C. $[{\text{CoF}}_6{]}^{3-}$ : Outer orbital complex; ${\text{d}}^2{\text{sp}}^3$ hybridized D. $[{\text{FeF}}_6{]}^{3-}$ : Outer orbital complex; ${\text{sp}}^3{\text{ d}}^2$ hybridized E. $[\text{Ni}(\text{CN}{)}_4{]}^{2-}$ : Inner orbital complex; ${\text{sp}}^3$ hybridized Choose the correct answer from the options given below :

    1. A.C & D Only
    2. B.A, C & E Only
    3. C.A, B, C, D & E
    4. D.A, B & D Only
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    Answer: D

22. Q722026 · 23 Jan 2026 · Shift 2· Numerical answer

    Total number of unpaired electrons present in the central metal atoms/ions of $[\text{Ni}(\text{CO}{)}_4],[{\text{NiCl}}_4{]}^{2-},[{\text{PtCl}}_2({\text{NH}}_3{)}_2],[\text{Ni}(\text{CN}{)}_4{]}^{2-}$ and $[\text{Pt}(\text{CN}{)}_4{]}^{2-}$ is _____.

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    Answer: 2

23. Q522026 · 21 Jan 2026 · Shift 1

    Given below are two statements : Statement I : Among $[\mathrm{Cu}(\mathrm{N}{\mathrm{H}}_3{)}_4{]}^{2+},[\mathrm{Ni}(\mathrm{en}{)}_3{]}^{2+},[\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{2+}$ and $[\mathrm{Mn}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+},[\mathrm{Mn}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ has the maximum number of unpaired electrons. Statement II : The number of pairs among $\left\{[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-},[\mathrm{Ni}(\mathrm{CO}{)}_4]\right\},\left\{[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-},[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}\right\}$ and $\left\{[\mathrm{Ni}(\mathrm{CO}{)}_4],[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}\right\}$ that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer from the options given below :

    1. A.Statement I is false but Statement II is true
    2. B.Both Statement I and Statement II are false
    3. C.Both Statement I and Statement II are true
    4. D.Statement I is true but Statement II is false
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    Answer: D

24. Q612026 · 21 Jan 2026 · Shift 1

    Given below are two statements : Statement I : The number of species among $\mathrm{S}{\mathrm{F}}_4,\mathrm{N}{\mathrm{H}}_4^{+},[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-},\mathrm{Xe}{\mathrm{F}}_4,[\mathrm{PtC}{\mathrm{l}}_4{]}^{2-},\mathrm{Se}{\mathrm{F}}_4$ and $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$, that have tetrahedral geometry is 3 . Statement II : In the set [ $\mathrm{N}{\mathrm{O}}_2,\mathrm{Be}{\mathrm{H}}_2,\mathrm{B}{\mathrm{F}}_3,\mathrm{AlC}{\mathrm{l}}_3$ ], all the molecules have incomplete octet around central atom. In the light of the above statements, choose the correct answer from the options given below:

    1. A.Both Statement I and Statement II are true
    2. B.Statement I is true but Statement II is false
    3. C.Statement I is false but Statement II is true
    4. D.Both Statement I and Statement II are false
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    Answer: C

25. Q642026 · 21 Jan 2026 · Shift 2

    Given below are two statements : Statement I : Crystal Field Stabilization Energy (CFSE) of $[\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ is greater than that of $[\mathrm{Mn}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$. 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 :

    1. A.Statement I is true but Statement II is false
    2. B.Both Statement I and Statement II are true
    3. C.Both Statement I and Statement II are false
    4. D.Statement I is false but Statement II is true
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    Answer: B