Coordination Compounds · JEE Main previous year questions

2019 10 questions

1. Q742019 · 12 Apr 2019 · Shift 1
   
   1. A.$[{\text{Fe(phen)}}_3{]}^{2+}$
   2. B.$[{\text{Zn(phen)}}_3{]}^{2+}$
   3. C.$[{\text{Co(phen)}}_3{]}^{2+}$
   4. D.$[{\text{Ni(phen)}}_3{]}^{2+}$
   Show answer

   Answer: A

2. Q772019 · 12 Apr 2019 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: A

3. Q772019 · 10 Apr 2019 · Shift 1

   Three complexes, $[\mathrm{CoCl}(\mathrm{N}{\mathrm{H}}_3{)}_5{]}^{2+}$(I), $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_5{\mathrm{H}}_2\mathrm{O}{]}^{3+}$ (II) and $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6{]}^{3+}$(III) absorb light in the visible region. The correct order of the wavelength of light absorbed by them is :

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

   Answer: C

4. Q792019 · 10 Apr 2019 · Shift 2

   The crystal field stabilization energy (CFSE) of $[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6]\mathrm{C}{\mathrm{l}}_2$ and ${\mathrm{K}}_2[\mathrm{NiC}{\mathrm{l}}_4]$ respectively, are :

   1. A.$-0.4{\Delta }_0$ and $-0.8{\Delta }_t$
   2. B.$-0.6{\Delta }_0$ and $-0.8{\Delta }_t$
   3. C.$-2.4{\Delta }_0$ and $-1.2{\Delta }_t$
   4. D.$-0.4{\Delta }_0$ and $-1.2{\Delta }_t$
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   Answer: A

5. Q652019 · 9 Apr 2019 · Shift 2
   
   1. A.8 and 6
   2. B.8 and 8
   3. C.6 and 8
   4. D.6 and 6
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   Answer: C

6. Q792019 · 9 Apr 2019 · Shift 2

   The correct statements among I to III are : (I) Valence bond theory cannot explain the color exhibited by transition metal complexes. (II) Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes. (III) Valence bond theory cannot distinguish ligands as weak and strong field ones.

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

7. Q732019 · 12 Jan 2019 · Shift 1

   The metal d-orbitals that are directly facing the ligands in ${\mathrm{K}}_3[\mathrm{Co}(\mathrm{CN}{)}_6]$ are -

   1. A.${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}$ and ${\mathrm{d}}_{{\mathrm{z}}^2}$
   2. B.${\mathrm{d}}_{\mathrm{xy}}$, ${\mathrm{d}}_{\mathrm{xz}}$ and ${\mathrm{d}}_{\mathrm{yz}}$
   3. C.${\mathrm{d}}_{\mathrm{xz}}$, ${\mathrm{d}}_{\mathrm{yz}}$ and ${\mathrm{d}}_{{\mathrm{z}}^2}$
   4. D.${\mathrm{d}}_{\mathrm{xy}}$ and ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}$
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   Answer: A

8. Q772019 · 12 Jan 2019 · Shift 2

   The magnetic moment of an octahedral homoleptic Mn(II) complex is 5.9 BM. The suitable ligand for this complex is -

   1. A.$\mathrm{C}{\mathrm{N}}^{-}$
   2. B.ethylenediamine
   3. C.$\mathrm{NC}{\mathrm{S}}^{-}$
   4. D.CO
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   Answer: C

9. Q732019 · 11 Jan 2019 · Shift 2

   The number of bridging CO ligand(s) and Co-Co bond(s) in $\mathrm{C}{\mathrm{o}}_2(\mathrm{CO}{)}_8$, respectively are :

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

10. Q742019 · 9 Jan 2019 · Shift 1

    Two complexes $[\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6]\mathrm{C}{\mathrm{l}}_3$ (A) and $[\mathrm{Cr}(\mathrm{N}{\mathrm{H}}_3{)}_6]\mathrm{C}{\mathrm{l}}_3$ (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is :

    1. A.${\Delta }_0$ values of (A) and (B) are calculated from the energies of violet and yellow light, respectively
    2. B.both are paramagnetic with three unpaired electrons
    3. C.both absorb energies corresponding to their complementary colors.
    4. D.${\Delta }_0$ value for (A) is less than that of (B).
    Show answer

    Answer: A