Write any two postulates of erner’s theory of Co-ordination compound

1.	Write any two postulates of erner’s theory of Co-ordination compounds.
Answer» Postulates: 1. Central metal ion in a complex shows two types of valences primary valence and secondary valence. 2. The primary alence is ionisable and satisfied by negative ions. 3. The secondary valence is non ionisable. It is equal to the coordination number of the central metal ion or atom. It is fixed for a metal. Secondary valences are satisfied by negative ions or neural molecules (ligands). 4. The primary valence is non directional. The secondary valence is directional. Ions or molecules attached to satisfy secondary valences have characteristic spatial arrangements. Secondary valence decides geometry of the complex compound.

Write any two postulates of erner’s theory of Co-ordination compounds.

Answer»

Postulates:

1. Central metal ion in a complex shows two types of valences primary valence and secondary valence.

2. The primary alence is ionisable and satisfied by negative ions.

3. The secondary valence is non ionisable. It is equal to the coordination number of the central metal ion or atom. It is fixed for a metal. Secondary valences are satisfied by negative ions or neural molecules (ligands).

4. The primary valence is non directional. The secondary valence is directional. Ions or molecules attached to satisfy secondary valences have characteristic spatial arrangements. Secondary valence decides geometry of the complex compound.

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