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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.

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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.

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15.
The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.

In both case Mn is in the +2 oxidation state. In [Mn(H₂O)]^2- water is the weak field ligand. Therefore, the electrons arrangement of the electrons in is T_2g³ e_g². In [Mn(CN)]^4- cyanide is strong field ligand. Therefore, the arrangement of the electrons is T_2g⁵ e_g⁰.

Hence, hexaaquo manganese (ll) ion has five unpaired electrons, while hexacyano ion has only one unpaired electron.

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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–

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

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

15.
The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.