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Coordination Compounds

Short Answer Type

281. Explain the geometry of Ni(CO)₄ by valence bond theory. Why is this molecule diamagnetic? (Atomic number of Ni = 28).

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282.
Using valency bond approach predict the shape and magnetism (paramagnetic or diamagnetic) of [Ni(CN)₄]^–.

In [Ni(CN)₄]^2-, 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. Thus [Ni(CN)₄]^2- is diamagnetic.

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283. Using valence bond approach, predict the shape and magnetism (paramagnetic or diamagnetic) of [Ni(CO)₄].

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284.

Explain the following terms: (i) Inner orbital complex and (ii) outer orbital complex.

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285.

What is meant by stability constant of a complex?

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286.

Define cis-trans isomerism. Draw the cis and trans isomers of [Co(NH₃)₃Cl₃) ion.

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287.

Deduce the structures of [NiCl₄]^2– and [Ni(CN)₄]^2– considering the hybridization of the metal ion. Calculate the magnetic moment (spin only) of the species.

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Long Answer Type

288. Describe briefly the nature of bonding in metal carbonyls.

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289.

Illustrate with an example each of the following terms: (i) Ionization isomerism, (ii) coordination isomerism, (iii) Linkage isomerism, (iv) Geometrical isomerism (v) Optical isomerism.

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