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Coordination Compounds

Short Answer Type

121.

On the basis of the following observations made with aqueous solutions, assign primary and secondary valencies to metals in the following compounds:

Formula	Motes of AgCl precipitated with excess AgNO₃
(i) PdCl_2.4NH₃	2
(ii) NiCl_2.6H₂O	2
(iii) PtCl₄.2HCl	0
(iv) CoCl₃.4NH₃	1
(v) PtCl₂.2NH₃	0

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Long Answer Type

122. Briefly write the rules for writing the formulas of mononuclear coordination compounds.

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123.

Briefly explain the rules for writing down the names of the coordination compounds.

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Short Answer Type

124.

What are ligands? Give examples.

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125.

What are ambident ligands? What are their importance?

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126. Briefly classify the type of ligands on the basis of their ligating ability.

Ligand on the basis of their ligating ability can be classified as:

(i) Monodenate: When the ligands can donate the pair of electrons from one atom, it is called monodenate ligand, e.g., NH₃, H₂O, CN^– etc.

(ii) Didentate: When the ligand can donate the pair of electrons through two atoms of the ligand, it is called didentate ligand, e.g., ethylene diamine

(iii) Polydentate ligands : When the ligand has three or more atoms through which it can donate electron pairs, then the ligands are called polydentate ligands, e.g., edta(ethylene diamine tetra-acetate ion)