Coordination Compounds · JEE Main previous year questions

2024 24 questions

1. Q752024 · 9 Apr 2024 · Shift 1

   Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The total number of geometrical isomers shown by $[\mathrm{Co}(\mathrm{en}{)}_2\mathrm{C}{\mathrm{l}}_2{]}^{+}$ complex ion is three. Reason (R): $[\mathrm{Co}(\mathrm{en}{)}_2\mathrm{C}{\mathrm{l}}_2{]}^{+}$ complex ion has an octahedral geometry. In the light of the above statements, choose the most appropriate answer from the options given below :

   1. A.(A) is correct but (R) is not correct
   2. B.(A) is not correct but (R) is correct
   3. C.Both (A) and (R) are correct but (R) is not the correct explanation of (A)
   4. D.Both (A) and (R) are correct and (R) is the correct explanation of (A)
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   Answer: B

2. Q832024 · 9 Apr 2024 · Shift 1· Numerical answer

   Number of ambidentate ligands among the following is ______. $\mathrm{N}{\mathrm{O}}_2^{-},\mathrm{SC}{\mathrm{N}}^{-},{\mathrm{C}}_2{\mathrm{O}}_4^{2-},\mathrm{N}{\mathrm{H}}_3,\mathrm{C}{\mathrm{N}}^{-},\mathrm{S}{\mathrm{O}}_4^{2-},{\mathrm{H}}_2\mathrm{O}$.

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   Answer: 3

3. Q752024 · 9 Apr 2024 · Shift 2

   Match List I with List II $$\begin{array}{llll}& \text{LIST I}& & \text{LIST II}\\ \text{A.}& {\mathrm{K}}_2[\mathrm{Ni}(\mathrm{CN}{)}_4]& \text{I.}& s{p}^3\\ \text{B.}& [\mathrm{Ni}(\mathrm{CO}{)}_4]& \text{II.}& s{p}^3{d}^2\\ \text{C.}& [\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6]\mathrm{C}{\mathrm{l}}_3& \text{III.}& ds{p}^2\\ \text{D.}& \mathrm{N}{\mathrm{a}}_3[\mathrm{Co}{\mathrm{F}}_6]& \text{IV.}& d^{2}s{p}^3\end{array}$$ Choose the correct answer from the options given below:

   1. A.A-III, B-II, C-IV, D-I
   2. B.A-III, B-I, C-II, D-IV
   3. C.A-I, B-III, C-II, D-IV
   4. D.A-III, B-I, C-IV, D-II
   Show answer

   Answer: D

4. Q792024 · 9 Apr 2024 · Shift 2

   The coordination environment of $\mathrm{C}{\mathrm{a}}^{2+}$ ion in its complex with $\mathrm{EDT}{\mathrm{A}}^{4-}$ is :

   1. A.trigonal prismatic
   2. B.octahedral
   3. C.square planar
   4. D.tetrahedral
   Show answer

   Answer: B

5. Q732024 · 8 Apr 2024 · Shift 1

   An octahedral complex with the formula $\mathrm{CoC}{\mathrm{l}}_3\cdot \mathrm{nN}{\mathrm{H}}_3$ upon reaction with excess of $\mathrm{AgN}{\mathrm{O}}_3$ solution gives 2 moles of $\mathrm{AgCl}$. Consider the oxidation state of $\mathrm{Co}$ in the complex is '$x$'. The value of "$x+n$" is ____.

   1. A.6
   2. B.5
   3. C.3
   4. D.8
   Show answer

   Answer: D

6. Q782024 · 8 Apr 2024 · Shift 1

   Given below are two statements: Statement I: $\mathrm{N}(\mathrm{C}{\mathrm{H}}_3{)}_3$ and $\mathrm{P}(\mathrm{C}{\mathrm{H}}_3{)}_3$ can act as ligands to form transition metal complexes. Statement II: As N and P are from same group, the nature of bonding of $\mathrm{N}(\mathrm{C}{\mathrm{H}}_3{)}_3$ and $\mathrm{P}(\mathrm{C}{\mathrm{H}}_3{)}_3$ is always same with transition metals. In the light of the above statements, choose the most appropriate answer from the options given below:

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

   Answer: D

7. Q802024 · 8 Apr 2024 · Shift 1

   Match List I with List II LIST I (Compound) A. $\mathrm{F}{\mathrm{e}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6{]}_3\cdot \mathrm{x}{\mathrm{H}}_2\mathrm{O}$ B. $[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NOS}{]}^{4-}$ C. $[\mathrm{Fe}(\mathrm{SCN}){]}^{2+}$ D. $(\mathrm{N}{\mathrm{H}}_4{)}_3\mathrm{P}{\mathrm{O}}_4\cdot 12Mo{\mathrm{O}}_3$ LIST II (Colour) I. Violet II. Blood Red III. Prussian Blue IV. Yellow Choose the correct answer from the options given below:

   1. A.A-IV, B-I, C-II, D-III
   2. B.A-I, B-II, C-III, D-IV
   3. C.A-II, B-III, C-IV, D-I
   4. D.A-III, B-I, C-II, D-IV
   Show answer

   Answer: D

8. Q642024 · 8 Apr 2024 · Shift 2

   Match List I with List II $$\begin{array}{llll}& \text{LIST I}& & \text{LIST II}\\ & \text{(Complex ion)}& & \text{(Spin only magnetic moment in B.M.)}\\ \text{A.}& [\mathrm{Cr}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}& \text{I.}& 4.90\\ \text{B.}& [\mathrm{NiC}{\mathrm{l}}_4{]}^{2-}& \text{II.}& 3.87\\ \text{C.}& [\mathrm{Co}{\mathrm{F}}_6{]}^{3-}& \text{III.}& 0.0\\ \text{D.}& [\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}& \text{IV.}& 2.83\end{array}$$ Choose the correct answer from the options given below :

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

9. Q832024 · 8 Apr 2024 · Shift 2· Numerical answer

   Total number of unpaired electrons in the complex ions $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}$ and $[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-}$ is ______.

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   Answer: 2

10. Q712024 · 6 Apr 2024 · Shift 2

    Match List I with List II. | LIST I (Tetrahedral Complex) | LIST II (Electronic configuration) | | :--- | :--- | | A. ${\text{TiCl}}_4$ | I. ${\text{e}}^2,{\text{t}}_2^0$ | | B. $[{\text{FeO}}_4{]}^{2-}$ | II. ${\text{e}}^4,{\text{t}}_2^3$ | | C. $[{\text{FeCl}}_4{]}^{-}$ | III. ${\text{e}}^0,{\text{t}}_2^0$ | | D. $[{\text{CoCl}}_4{]}^{2-}$ | IV. ${\text{e}}^2,{\text{t}}_2^3$ | Choose the correct answer from the options given below :

    1. A.(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
    2. B.(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
    3. C.(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
    4. D.(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
    Show answer

    Answer: B

11. Q782024 · 6 Apr 2024 · Shift 2

    The correct IUPAC name of $[{\text{PtBr}}_2({\text{PMe}}_3{)}_2]$ is :

    1. A.bis(trimethylphosphine)dibromoplatinum(II)
    2. B.dibromodi(trimethylphosphine)platinum(II)
    3. C.dibromobis(trimethylphosphine)platinum(II)
    4. D.bis[bromo(trimethylphosphine)]platinum(II)
    Show answer

    Answer: C

12. Q782024 · 5 Apr 2024 · Shift 2

    The metal atom present in the complex $\mathrm{MABXL}$ (where $\mathrm{A},\mathrm{B},\mathrm{X}$ and $\mathrm{L}$ are unidentate ligands and $\mathrm{M}$ is metal) involves $\mathrm{s}{\mathrm{p}}^3$ hybridization. The number of geometrical isomers exhibited by the complex is :

    1. A.0
    2. B.2
    3. C.3
    4. D.4
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    Answer: A

13. Q612024 · 4 Apr 2024 · Shift 1

    Number of complexes from the following with even number of unpaired "d" electrons is ____ $[\mathrm{V}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},[\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+},[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},[\mathrm{Cu}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ [Given atomic numbers: $\mathrm{V}=23,\mathrm{Cr}=24,\mathrm{Fe}=26,\mathrm{Ni}=28,\mathrm{Cu}=29$]

    1. A.1
    2. B.5
    3. C.2
    4. D.4
    Show answer

    Answer: C

14. Q722024 · 4 Apr 2024 · Shift 1

    The correct sequence of ligands in the order of decreasing field strength is :

    1. A.$\mathrm{NC}{\mathrm{S}}^{-}>\mathrm{EDT}{\mathrm{A}}^{4-}>\mathrm{C}{\mathrm{N}}^{-}>\mathrm{CO}$
    2. B.$\mathrm{CO}>{\mathrm{H}}_2\mathrm{O}>{\mathrm{F}}^{-}>{\mathrm{S}}^{2-}$
    3. C.${\mathrm{S}}^{2-}>{}^{-}\mathrm{OH}>\mathrm{EDT}{\mathrm{A}}^{4-}>\mathrm{CO}$
    4. D.${}^{-}\mathrm{OH}>{\mathrm{F}}^{-}>\mathrm{N}{\mathrm{H}}_3>\mathrm{C}{\mathrm{N}}^{-}$
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    Answer: B

15. Q642024 · 4 Apr 2024 · Shift 2

    The number of unpaired d-electrons in $[\text{Co}({\text{H}}_2\text{O}{)}_6{]}^{3+}$ is _________.

    1. A.0
    2. B.2
    3. C.1
    4. D.4
    Show answer

    Answer: A

16. Q642024 · 1 Feb 2024 · Shift 1

    Which of the following complex is homoleptic?

    1. A.$[\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_2\mathrm{C}{\mathrm{l}}_2]$
    2. B.$[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_4\mathrm{C}{\mathrm{l}}_2{]}^{+}$
    3. C.$[\mathrm{Fe}(\mathrm{N}{\mathrm{H}}_3{)}_4\mathrm{C}{\mathrm{l}}_2{]}^{+}$
    4. D.$[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$
    Show answer

    Answer: D

17. Q702024 · 1 Feb 2024 · Shift 1

    Given below are two statements : Statement (I) : A solution of $[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ is green in colour. Statement (II) : A solution of $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$ is colourless. In the light of the above statements, choose the most appropriate answer from the options given below :

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

    Answer: B

18. Q652024 · 1 Feb 2024 · Shift 2

    $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}$ and $[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}$ are respectively known as :

    1. A.Inner orbital Complex, Spin paired Complex
    2. B.Spin paired Complex, Spin free Complex
    3. C.Spin free Complex, Spin paired Complex
    4. D.Outer orbital Complex, Inner orbital Complex
    Show answer

    Answer: B

19. Q672024 · 31 Jan 2024 · Shift 1

    The correct statements from following are: A. The strength of anionic ligands can be explained by crystal field theory. B. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds. C. The hybridization involved in formation of $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-}$ complex is $\mathrm{ds}{\mathrm{p}}^2$. D. The number of possible isomer(s) of cis- $[\mathrm{PtC}{\mathrm{l}}_2(\mathrm{en}{)}_2{]}^{2+}$ is one Choose the correct answer from the options given below:

    1. A.B, C only
    2. B.B, D only
    3. C.A, C only
    4. D.A, D only
    Show answer

    Answer: A

20. Q782024 · 31 Jan 2024 · Shift 2

    Match List I with List II $$\begin{array}{llll}& \text{List - I (Complex ion)}& & \text{List - II (Electronic Configuration)}\\ \text{(A)}& [\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}& \text{(I)}& t_{2g}{}^2{e}_g^0\\ \text{(B)}& [\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}& \text{(II)}& t_{2g}{}^3{e}_g{}^0\\ \text{(C)}& [\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}& \text{(III)}& t_{2g}{}^3{e}_g{}^2\\ \text{(D)}& [\mathrm{V}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}& \text{(IV)}& t_{2g}{}^6{e}_g^2\end{array}$$ Choose the correct answer from the options given below:

    1. A.A-IV, B-I, C-II, D-III
    2. B.A-III, B-II, C-IV, D-I
    3. C.A-II, B-III, C-IV, D-I
    4. D.A-IV, B-III, C-I, D-II
    Show answer

    Answer: C

21. Q762024 · 30 Jan 2024 · Shift 1

    Choose the correct statements from the following : (A) Ethane-1, 2-diamine is a chelating ligand. (B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite. (C) Cyanide ion is used as ligand for leaching of silver. (D) Phosphine acts as a ligand in Wilkinson catalyst. (E) The stability constants of $\mathrm{C}{\mathrm{a}}^{2+}$ and $\mathrm{M}{\mathrm{g}}^{2+}$ are similar with EDTA complexes. Choose the correct answer from the options given below :

    1. A.(B), (C), (E) only
    2. B.(A), (D), (E) only
    3. C.(C), (D), (E) only
    4. D.(A), (B), (C) only
    Show answer

    Answer: D

22. Q762024 · 29 Jan 2024 · Shift 1

    In which one of the following metal carbonyls, $\mathrm{CO}$ forms a bridge between metal atoms?

    1. A.$[\mathrm{O}{\mathrm{s}}_3(\mathrm{CO}{)}_{12}]$
    2. B.$[\mathrm{R}{\mathrm{u}}_3(\mathrm{CO}{)}_{12}]$
    3. C.$[\mathrm{M}{\mathrm{n}}_2(\mathrm{CO}{)}_{10}]$
    4. D.$[\mathrm{C}{\mathrm{o}}_2(\mathrm{CO}{)}_8]$
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    Answer: D

23. Q682024 · 27 Jan 2024 · Shift 1

    Consider the following complex ions $\mathrm{P}=[\mathrm{Fe}{\mathrm{F}}_6{]}^{3-}$ $\mathrm{Q}=[\mathrm{V}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ $\mathrm{R}=[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$ The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is :

    1. A.$\mathrm{R}<\mathrm{Q}<\mathrm{P}$
    2. B.$\mathrm{R}<\mathrm{P}<\mathrm{Q}$
    3. C.$\mathrm{Q}<\mathrm{R}<\mathrm{P}$
    4. D.$\mathrm{Q}<\mathrm{P}<\mathrm{R}$
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    Answer: C

24. Q822024 · 27 Jan 2024 · Shift 2· Numerical answer

    The Spin only magnetic moment value of square planar complex $[\text{Pt}({\text{NH}}_3{)}_2\text{Cl }({\text{NH}}_2{\text{CH}}_3)]\text{Cl}$ is _______ B.M. (Nearest integer) (Given atomic number for $\text{Pt}=78$)

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    Answer: 0