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Question

(i) What are the postulates of Werner's theory?
(ii) Write the IUPAC names fo K3[Fe(CN)6], [Co(NH3)6]Cl3.

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Solution

i) Postulates of Werner’s theory:

  • Every metal atom has two types of valencies

i)Primary valency or ionisable valency

ii)Secondary valency or non ionisable valency

  • The primary valency corresponds to the oxidation state of the metal ion.The primary valency of the metal ion is always satisfied by negative ions.
  • Secondary valency corresponds to the coordination number of the metal ion or atom. The secondary valencies may be satisfied by either negative ions or neutral molecules.
  • The molecules or ion that satisfy secondary valencies are called ligands.
  • The ligands which satisfy secondary valencies must project in definite directions in space. So the secondary valencies are directional in nature whereas the primary valencies are non-directional in nature.
  • The ligands have unshared pair of electrons. These unshared pair of electrons are donated to central metal ion or atom in a compound. Such compounds are called coordination compounds.

(ii) K3[Fe(CN)6] is Potassium hexacyanoferrate(III).

[Co(NH3)6]Cl3.is Hexamminecobalt (III) chloride.


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