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Coordination Compounds

Short Answer Type

11.

[NiCl {]_{4}}^{2 -}

is paramagnetic while

[Ni (CO)_{4}]

is diamagnetic though both are tetrahedral. Why?

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12. $[Fe (H_{2} O)_{6}]^{3 +}$ is strongly paramagnetic whereas $[Fe (CN)_{6}]^{3 -}$ is weakly paramagnetic. Explain.

In presence of CN^–, (a strong ligand) the 3d electrons pair up leaving only one unpaired electron. The hybridisation is d²sp³ forming inner orbital complex. In the presence of H₂O, (a weak ligand), 3d electrons do not pair up. The hybridisation is sp³d²forming an outer orbital complex containing five unpaired electrons, Thus greater the number of unpaired electrons more is the paramagnetic behavior.

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13. Explain

{[Co ({NH}_{3})_{6}]}^{3 +}

is an inner orbital complex whereas

{[Ni ({NH}_{3})_{6}]}^{2 +}

is an outer orbital complex.

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14.

Predict the number of unpaired electrons in the square planar [Pt(CN)₄,]^2– ion.

349 Views

15.

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.

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16. Calculate the overall complex dissociation equilibrium constant for the Cu(NH₃)₄²⁺ion, given β₄ for this complex is 2.1 x 10¹³.

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17.

Identify the ligands from the following coordination compounds:
(a)    [Co(en)₂Cl(NO₂)₂]
(b)    K[Co(CN)(CO₂)(NO)]
(c)    K₃[Al(OH)₆]
(d)    [Co(H₂O)₂(NH₃)₄](OH)₃

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18. Write IUPAC name of the following complexes:
(a) [Fe(H₂O)₆]SO₄
(b) [Cu(en)₂(NO₃)₂

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19. Give IUPAC name of the following complexes:
(i) Na₂[Fe(CN)₅(NO)], (ii) K₂[Zn(CN)₄]

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20.

Provide systematic names to the following complexes:
(i) [Fe(H₂O)₅(NO)]SO₄,
(ii) [Cr(NH₃)₆]³⁺(iii) [Pt(NH₃)₂Cl₂],
(iv) [NiCl₄]^2–

421 Views

Previous Year Papers

Test Series

Test Yourself

Short Answer Type

12. [Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic. Explain.

12. $[Fe (H_{2} O)_{6}]^{3 +}$ is strongly paramagnetic whereas $[Fe (CN)_{6}]^{3 -}$ is weakly paramagnetic. Explain.