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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.

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127. What do you mean by coordination number? Explain with example.

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128. What is a coordination polyhedron?

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129. What do you mean be denticity and chelation?

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Long Answer Type

130. Briefly explain the type of chelation.

Chelation can be of three major types:

(i) Didentate chelation: When chelation is done by didentate ligand it is called Didentate chelation, e.g., [PtCl₂(en)] in this en is a didentate ligands.

(ii) Terdentate chelation: When chelation is done by a terdentate (tridentate) ligand it is called tredentate chelation e.g., [PtCl(dien)⁺, dien is a terdentate ligand.

(iii) Tetradentate chelation: When chelation is done by tetradentate ligand it is called tetradentate chelation e.g., [Pt(trien)]²⁺, trien is a tetradentate ligand.

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