Explain postulates of Werner's theory.
Class 12
Chemistry
Coordination compounds
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1. Metals have 2 types of valencies, pimary valency (oxidation state_ and secondary valency (coordination nmbr)
2. An atom must satisfy both these valencies
3. Metals have fixed nmbr of secondary valencies
4. Ligands which satisfy secondary valency have fixed positions
5. Geometry of a complex is defined by the arangement of ligands in space
6. Pimay valencies are non diectional
2. An atom must satisfy both these valencies
3. Metals have fixed nmbr of secondary valencies
4. Ligands which satisfy secondary valency have fixed positions
5. Geometry of a complex is defined by the arangement of ligands in space
6. Pimay valencies are non diectional
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Answer:
( a ) A metal shows two kinds of valencies viz primary valency and secondary valency.Negative ionssatisfy primary valenciesand secondaryvalencies are filled by bothneutral ions and negative ions.
( b ) A metal ion has a fixed amount of secondary valencies about the central atom. These valenciesalso orient themselves in a particular direction in the space provided to the definite geometry of the coordination compound.
( c ) Secondary valencies cannot be ionized , while primary valencies can usually be ionized.
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