what is Werner theory what is it demerit
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werner theory:-
The important postulates of Werner's theory are: The central metal or the metal atoms in coordination compounds show two types of valency. ... It means that the coordination number is fixed. The metal atom works towards satisfying both its primary and secondary valencies.
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Demerits of Werner's theory
The theory presumes that the primary valencies are always negative ions. This is true for most of the co-ordination compounds but some exceptions exist. For example, potassium ferrocyanide, K4[Fe(CN)6], the primary valency is satisfied by potassium cations.
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