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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?

The spatial arrangement of the ligand atoms which are directly attached to the central atom/ion defines a coordination polyhedron about the central atom. The most common coordination polyhedra are octahedral, square planar and tetrahedral. For example, [Co(NH₃)₆]3⁺ is octahedral, [Ni(CO)₄] is
tetrahedral and [PtCl₄]^2– is square planar.

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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.

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