Coordination Compounds · JEE Main previous year questions

2023 32 questions

1. 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

2. 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

3. 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
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   Answer: B

4. 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

5. 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

6. 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
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   Answer: C

7. Q732023 · 24 Jan 2023 · Shift 2

   Which of the following cannot be explained by crystal field theory?

   1. A.The order of spectrochemical series
   2. B.Stability of metal complexes
   3. C.Magnetic properties of transition metal complexes
   4. D.Colour of metal complexes
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   Answer: A