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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.

[Co(NH₃)₆]³⁺	[Ni(NH₃)₆]²⁺
Electronic configuration of cobalt = d⁶	Electronic configuration of Nickel = d⁸
In this compound oxidation state of cobalt is +3	In this compound oxidation state is +2
NH₃ is a strong field ligand therefore it causes the pairing. Hence, Ni can undergo d²sp³ hybridization. Therefore, it is an inner orbital complex.	If NH₃ causes the pairing, then only one 3d orbital is empty. Thus, it cannot undergo d ²sp³ hybridization. Therefore, it undergoes sp³d ² hybridization. Hence, it forms 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]

1628 Views

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

13. Explain Co(NH3)63+ is an inner orbital complex whereas Ni(NH3)62+ is an outer orbital complex.

13. Explain ${[Co ({NH}_{3})_{6}]}^{3 +}$ is an inner orbital complex whereas ${[Ni ({NH}_{3})_{6}]}^{2 +}$ is an outer orbital complex.