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Coordination Compounds

Short Answer Type

211.

Explain the following:
[Ni(H₂,O)₆]²⁺ turns blue when changed to [Ni(NH₃)₆]³⁺ by adding NH₃

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212.

Explain the following:
Violet coloured [Cr(H₂O)₆]³⁺ becomes bright blue when reduced to [Cr(H₂O)₆]²⁺

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Long Answer Type

213. What do you understand by the term stability constant, K of a complex? Knowing that the value of K for [Cu(NH₃)₄]²⁺ is 4.5 x 10¹¹ and for [Cu(CN)₄]^2– is 2.0 x 10²⁷, suggest
(a) Which complex species will furnish less Cu²⁺ ions in solution and
(b) Which out of NH₃and CN^– is a stronger ligand?

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Short Answer Type

214. Illustrate with an example ionization isomerism in coordination compounds.

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215. Formation of complex is exothermic or endothermic process. Explain why? What is the effect of temperature on stability of complex compound?

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216. Give the IUPAC name of [CrCl₂ (H₂O)₄]Cl

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217.

Give the number of unpaired electrons in the following complex ions:
[FeF₆]^4– and [Fe(CN)₆]^4–

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218.

Name the isomerism exhibited by the following pair of coordination compounds:
[Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄] Br

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219. What is a ligand? Give an example of a bidentate ligand.

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Long Answer Type

220.
Explain as to how the two complexes of nickel, [Ni(CN)₄]^2– and Ni(CO)₄, have different structures but do not differ in their magnetic behaviour (Ni = 28).

(i) [Ni(CN)₄]^2–: In case the valence shell electronic configuration of ground state Ni atom is 3d⁸ 4s². There is Ni²⁺ ion for which the electronic configuration in the valence shell is 3d⁸ 4s⁰.

In presence of strong field CN^- ions, all the electrons are paired up. The empty 4d, 3s and two 4p orbitals undergo dsp² hybridization to make bonds with CN^- ligands in square planar geometry

(ii)Ni(CO)₄ : In case the valence shell electronic configuration of ground state Ni atom is 3d⁸ 4s². All of these 10 electrons are pushed into 3d orbitals and get paired up when strong field CO ligands approach Ni atom. The empty 4s and three 4p orbitals undergo sp³ hybridization and form bonds with CO ligands to give tetrahedral