Explain the bonding in coordination compounds in terms of Werners postulates.
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Solution
Postulates of Werner's coordination theory: (1) Metal shows primary valence (ionizable, oxidation number) and secondary valence (non ionizable, coordination number).
(2) Coordination number (secondary valence) is fixed for every metal. (3) Negative ions satisfy primary valence and negative ions or neutral molecules satisfy secondary valence. (4) Secondary valencies are directional in nature and determine stereochemistry of complex.