Coordination Compounds · JEE Main previous year questions

2023 32 questions

1. Q742023 · 11 Apr 2023 · Shift 1

   Which of the following complex has a possibility to exist as meridional isomer?

   1. A.$[\mathrm{Pt}(\mathrm{N}{\mathrm{H}}_3{)}_2\mathrm{C}{\mathrm{l}}_2]$
   2. B.$[\mathrm{Co}(\mathrm{en}{)}_2\mathrm{C}{\mathrm{l}}_2]$
   3. C.$[\mathrm{Co}(\mathrm{en}{)}_3]$
   4. D.$[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_3(\mathrm{N}{\mathrm{O}}_2{)}_3]$
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   Answer: D

2. Q662023 · 11 Apr 2023 · Shift 2

   Match List I with List II | LIST I Complex | | LIST II Colour | | :--- | :--- | :--- | | A. $\mathrm{Mg}(\mathrm{N}{\mathrm{H}}_4)\mathrm{P}{\mathrm{O}}_4$ | I. | brown | | B. ${\mathrm{K}}_3[\mathrm{Co}(\mathrm{N}{\mathrm{O}}_2{)}_6]$ | II. | white | | C. $\mathrm{MnO}(\mathrm{OH}{)}_2$ | III. | yellow | | D. $\mathrm{F}{\mathrm{e}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6{]}_3$ | IV. | blue | Choose the correct answer from the options given below :

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

   Answer: B

3. Q672023 · 10 Apr 2023 · Shift 1

   The octahedral diamagnetic low spin complex among the following is :

   1. A.$[\text{Co}({\text{NH}}_3{)}_6{]}^{3+}$
   2. B.$[{\text{NiCl}}_4{]}^{2-}$
   3. C.$[{\text{CoCl}}_6{]}^{3-}$
   4. D.$[{\text{CoF}}_6{]}^{3-}$
   Show answer

   Answer: A

4. Q662023 · 10 Apr 2023 · Shift 2

   The correct order of the number of unpaired electrons in the given complexes is A. $[\text{Fe}(\text{CN}{)}_6{]}^{3-}$ B. $[{\text{FeF}}_6{]}^{3-}$ C. $[{\text{CoF}}_6{]}^{3-}$ D. $[\text{Cr}(\text{oxalate}{)}_3{]}^{3-}$ E. $[\text{Ni}(\text{CO}{)}_4]$ Choose the correct answer from the options given below:

   1. A.E < A < B < D < C
   2. B.A < E < D < C < B
   3. C.A < E < C < B < D
   4. D.E < A < D < C < B
   Show answer

   Answer: D

5. Q692023 · 10 Apr 2023 · Shift 2

   Match List I with List II $$\begin{array}{llll}& \text{List - I Complex}& & \text{List - II Crystal Field splitting energy }({\Delta }_0)\\ \text{A.}& [Ti(H_{2}O{)}_6{]}^{2+}& \text{I.}& -1.2\\ \text{B.}& [V(H_{2}O{)}_6{]}^{2+}& \text{II.}& -0.6\\ \text{C.}& [Mn(H_{2}O{)}_6{]}^{3+}& \text{III.}& 0\\ \text{D.}& [Fe(H_{2}O{)}_6{]}^{3+}& \text{IV.}& -0.8\end{array}$$ Choose the correct answer from the options given below:

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

   Answer: A

6. Q622023 · 8 Apr 2023 · Shift 1

   Which of the following complex is octahedral, diamagnetic and the most stable?

   1. A.$\mathrm{N}{\mathrm{a}}_3[\mathrm{CoC}{\mathrm{l}}_6]$
   2. B.$[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6]\mathrm{C}{\mathrm{l}}_2$
   3. C.${\mathrm{K}}_3[\mathrm{Co}(\mathrm{CN}{)}_6]$
   4. D.$[\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_6]\mathrm{C}{\mathrm{l}}_2$
   Show answer

   Answer: C

7. Q642023 · 8 Apr 2023 · Shift 1

   The correct order of spin only magnetic moments for the following complex ions is

   1. A.$[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-}<[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}<[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}<[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}$
   2. B.$[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}<[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}<[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-}<[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}$
   3. C.$[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-}<[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}<[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}<[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}$
   4. D.$[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}<[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}<[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-}<[\mathrm{Mn}(\mathrm{CN}{)}_6{]}^{3-}$
   Show answer

   Answer: C

8. Q612023 · 8 Apr 2023 · Shift 2

   Match List I with List II $$\begin{array}{llll}& \text{LIST I}& & \text{LIST II}\\ & \text{Coordination Complex}& & \text{Number of unpaired electrons}\\ \text{A.}& [\mathrm{Cr}(\mathrm{CN}{)}_6{]}^{3-}& \text{I.}& 0\\ \text{B.}& [\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}& \text{II.}& 3\\ \text{C.}& [\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}& \text{III.}& 2\\ \text{D.}& [\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{2+}& \text{IV.}& 4\end{array}$$ Choose the correct answer from the options given below:

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

   Answer: C

9. Q872023 · 6 Apr 2023 · Shift 1· Numerical answer

   Number of ambidentate ligands in a representative metal complex $[\text{M}(\text{en})(\text{SCN}{)}_4]$ is ________. [en = ethylenediamine]

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   Answer: 4

10. Q672023 · 6 Apr 2023 · Shift 2

    Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A : In the complex $\mathrm{Ni}(\mathrm{CO}{)}_4$ and $\mathrm{Fe}(\mathrm{CO}{)}_5$, the metals have zero oxidation state. Reason R : Low oxidation states are found when a complex has ligands capable of $\pi$-donor character in addition to the $\sigma$-bonding. In the light of the above statements, choose the most appropriate answer from the options given below

    1. A.A is not correct but R is correct
    2. B.A is correct but R is not 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
    Show answer

    Answer: B

11. Q712023 · 6 Apr 2023 · Shift 2

    The IUPAC name of ${\mathrm{K}}_3[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3]$ is:-

    1. A.Potassium tris(oxalato)cobalt(III)
    2. B.Potassium tris(oxalato)cobaltate(III)
    3. C.Potassium trioxalatocobaltate(III)
    4. D.Potassium trioxalatocobalt(III)
    Show answer

    Answer: C

12. Q812023 · 6 Apr 2023 · Shift 2· Numerical answer

    The number of species having a square planar shape from the following is ___________. $\mathrm{Xe}{\mathrm{F}}_4,\mathrm{S}{\mathrm{F}}_4,\mathrm{Si}{\mathrm{F}}_4,\mathrm{B}{\mathrm{F}}_4^{-},\mathrm{Br}{\mathrm{F}}_4^{-},[\mathrm{Cu}(\mathrm{N}{\mathrm{H}}_3{)}_4{]}^{2+},[\mathrm{FeC}{\mathrm{l}}_4{]}^{2-},[\mathrm{PtC}{\mathrm{l}}_4{]}^{2-}$

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    Answer: 4

13. Q692023 · 1 Feb 2023 · Shift 1

    A solution of ${\text{FeCl}}_3$ when treated with ${\text{K}}_4[\text{Fe}(\text{CN}{)}_6]$ gives a Prussian blue precipitate due to the formation of :

    1. A.$\text{Fe}[\text{Fe}(\text{CN}{)}_6]$
    2. B.${\text{Fe}}_4[\text{Fe}(\text{CN}{)}_6{]}_3$
    3. C.${\text{Fe}}_3[\text{Fe}(\text{CN}{)}_6{]}_2$
    4. D.$\text{K}[{\text{Fe}}_2(\text{CN}{)}_6]$
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    Answer: B

14. Q732023 · 31 Jan 2023 · Shift 1

    Cobalt chloride when dissolved in water forms pink colored complex $\underline{\mathrm{X}}$ which has octahedral geometry. This solution on treating with conc $\mathrm{HCl}$ forms deep blue complex, $\underline{\mathrm{Y}}$ which has a $\underline{\mathrm{Z}}$ geometry. $\mathrm{X}$, $\mathrm{Y}$ and $\mathrm{Z}$, respectively, are

    1. A.$\mathrm{X}=[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+},\mathrm{Y}=[{\mathrm{CoCl}}_4{]}^{2-},\mathrm{Z}=\text{Tetrahedral}$
    2. B.$\mathrm{X}=[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+},\mathrm{Y}=[{\mathrm{CoCl}}_6{]}^{3-},\mathrm{Z}=\text{Octahedral}$
    3. C.$\mathrm{X}=[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_4{\mathrm{Cl}}_2{]}^{+},\mathrm{Y}=[{\mathrm{CoCl}}_4{]}^{2-},\mathrm{Z}=\text{Tetrahedral}$
    4. D.$\mathrm{X}=[\mathrm{Co}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+},\mathrm{Y}=[{\mathrm{CoCl}}_6{]}^{3-},\mathrm{Z}=\text{Octahedral}$
    Show answer

    Answer: A

15. Q882023 · 31 Jan 2023 · Shift 2· Numerical answer

    If the CFSE of $[\mathrm{Ti}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}$ is $-96.0\text{ kJ/mol}$, this complex will absorb maximum at wavelength ___________ nm. (nearest integer) Assume Planck's constant $(\mathrm{h})=6.4\times 10^{-34}\text{ Js}$, Speed of light $(\mathrm{c})=3.0\times 10^8\text{ m/s}$ and Avogadro's Constant $({\mathrm{N}}_{\mathrm{A}})=6\times 10^{23}/\text{mol}$

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    Answer: 480

16. Q612023 · 30 Jan 2023 · Shift 1

    To inhibit the growth of tumours, identify the compounds used from the following : A. EDTA B. Coordination Compounds of Pt C. D - Penicillamine D. Cis - Platin Choose the correct answer from the option given below :

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

17. Q662023 · 30 Jan 2023 · Shift 1

    Which of the following is correct order of ligand field strength?

    1. A.${\mathrm{S}}^{2-}<{\mathrm{C}}_2{\mathrm{O}}_4^{2-}<{\mathrm{NH}}_3<\mathrm{en}<\mathrm{CO}$
    2. B.$\mathrm{CO}<\mathrm{en}<{\mathrm{NH}}_3<{\mathrm{C}}_2{\mathrm{O}}_4^{2-}<{\mathrm{S}}^{2-}$
    3. C.${\mathrm{S}}^{2-}<{\mathrm{NH}}_3<\mathrm{en}<\mathrm{CO}<{\mathrm{C}}_2{\mathrm{O}}_4^{2-}$
    4. D.${\mathrm{NH}}_3<\mathrm{en}<\mathrm{CO}<{\mathrm{S}}^{2-}<{\mathrm{C}}_2{\mathrm{O}}_4^{2-}$
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    Answer: A

18. Q892023 · 29 Jan 2023 · Shift 1· Numerical answer

    The sum of bridging carbonyls in $\mathrm{W}(\mathrm{CO}{)}_6$ and $\mathrm{M}{\mathrm{n}}_2(\mathrm{CO}{)}_{10}$ is ____.

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    Answer: 0

19. Q682023 · 29 Jan 2023 · Shift 2

    Correct order of spin only magnetic moment of the following complex ions is : (Given At.no. Fe : 26, Co : 27)

    1. A.$[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}>[\mathrm{Fe}{\mathrm{F}}_6{]}^{3-}>[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$
    2. B.$[\mathrm{Fe}{\mathrm{F}}_6{]}^{3-}>[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}>[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}$
    3. C.$[\mathrm{Fe}{\mathrm{F}}_6{]}^{3-}>[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}>[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}$
    4. D.$[\mathrm{Co}({\mathrm{C}}_2{\mathrm{O}}_4{)}_3{]}^{3-}>[\mathrm{Co}{\mathrm{F}}_6{]}^{3-}>[\mathrm{Fe}{\mathrm{F}}_6{]}^{3-}$
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    Answer: C

20. Q842023 · 29 Jan 2023 · Shift 2· Numerical answer

    The denticity of the ligand present in the Fehling's reagent is ___________.

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    Answer: 4

21. Q882023 · 25 Jan 2023 · Shift 1· Numerical answer

    The number of paramagnetic species from the following is ____. $[\mathrm{Ni}(\mathrm{CN}{)}_4{]}^{2-},[\mathrm{Ni}(\mathrm{CO}{)}_4],[\mathrm{NiC}{\mathrm{l}}_4{]}^{2-}$ $[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{4-},[\mathrm{Cu}(\mathrm{N}{\mathrm{H}}_3{)}_4{]}^{2+}$ $[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{3-}$ and $[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$

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    Answer: 4

22. Q692023 · 25 Jan 2023 · Shift 2

    Match List I with List II $$\begin{array}{llll}& \text{List I Coordination entity}& & \text{List II Wavelength of light absorbed in nm}\\ \text{A.}& [\mathrm{CoCl}(\mathrm{N}{\mathrm{H}}_3{)}_5{]}^{2+}& \text{I.}& 310\\ \text{B.}& [\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}& \text{II.}& 475\\ \text{C.}& [\mathrm{Co}(\mathrm{CN}{)}_6{]}^{3-}& \text{III.}& 535\\ \text{D.}& [\mathrm{Cu}({\mathrm{H}}_2\mathrm{O}{)}_4{]}^{2+}& \text{IV.}& 600\end{array}$$ Choose the correct answer from the options given below :

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

    Answer: B

23. Q862023 · 25 Jan 2023 · Shift 2· Numerical answer

    Total number of moles of AgCl precipitated on addition of excess of $\mathrm{AgN}{\mathrm{O}}_3$ to one mole each of the following complexes $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_4\mathrm{C}{\mathrm{l}}_2]\mathrm{Cl},[\mathrm{Ni}({\mathrm{H}}_2\mathrm{O}{)}_6]\mathrm{C}{\mathrm{l}}_2,[\mathrm{Pt}(\mathrm{N}{\mathrm{H}}_3{)}_2\mathrm{C}{\mathrm{l}}_2]$ and $[\mathrm{Pd}(\mathrm{N}{\mathrm{H}}_3{)}_4]\mathrm{C}{\mathrm{l}}_2$ is ____.

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    Answer: 5

24. Q892023 · 24 Jan 2023 · Shift 1· Numerical answer

    The d-electronic configuration of $[{\mathrm{CoCl}}_4{]}^{2-}$ in tetrahedral crystal field is $e^m{t}_2^n$. Sum of "m" and "number of unpaired electrons" is ____

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    Answer: 7

25. Q702023 · 24 Jan 2023 · Shift 2

    The hybridization and magnetic behaviour of cobalt ion in $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}$ complex, respectively is :

    1. A.$\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^2$ and paramagnetic
    2. B.$\mathrm{s}{\mathrm{p}}^3{\mathrm{d}}^2$ and diamagnetic
    3. C.${\mathrm{d}}^2\mathrm{s}{\mathrm{p}}^3$ and diamagnetic
    4. D.${\mathrm{d}}^2\mathrm{s}{\mathrm{p}}^3$ and paramagnetic
    Show answer

    Answer: C