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Coordination Compounds

Long Answer Type

191.

What is meant by stability of coordinate compound in solution? State the factors which govern stability of complexes.

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Short Answer Type

192. What is meant by the chelate effect? Give an example.

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193. Discuss briefly the role of coordination compounds in biological systems.

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194. Discuss briefly the role of coordination compounds in analytical chemistry.

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195. Discuss briefly the role of coordination compounds in medicinal chemistry.

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196. Discuss briefly the role of coordination compounds in extraction/metallurgy of metals.

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197.

What is macrocyclic effect?

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198.

How does the metal carbonyls gain stability although CO is a weak donor?

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199. [CoF₆]^3– is paramagnetic whereas [Co(C₂O₄)₃]^3– is diamagnetic. Why?

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200. [NiCl₄]^2– is paramagnetic in nature, explain.

The valence shell electronic configuration of ground state Ni atom is 3d⁸ 4s². since Ni²⁺ ion for which the electronic configuration in the valence shell is 3d⁸ 4s⁰. However, in presence of weak field Cl^- ligands, no pairing of d-electrons occurs. Therefore, Ni²⁺ undergoes sp³ hybridization to make bonds with Cl^- ligands in tetrahedral geometry. As there are unpaired electrons in the d-orbitals, NiCl₄^2- is paramagnetic.

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