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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]^–.

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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.

i) Inner orbital complexes that use inner d- orbitals in hybirdisation; for example [Co(NH₃)]³⁺ is inner orbital because the complex is using inner d-orbital therefore it’s hybridization is d²sp³. Also know as low spin complex.

ii) Outer-orbital:complex that is use outer d- orbitals in hybirdisation; for example [CoF₆]^3- uses outer orbital (4d ) in hybridisation (sp³d²). It is thus called outer orbital or high spin or spin free 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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