CBSE Class 12 Chemistry Coordination Compound Notes and Questions

CBSE Class 12 Chemistry Coordination Compound Notes and Questions. Based on CBSE and NCERT guidelines. The students should practice these Questions to gain perfection which will help him to get more marks in CBSE examination. Based on CBSE and NCERT guidelines. The preparation should be in a manner which helps the students to concentrate more in areas which carry more marks. 


The compounds which contain dative bonds between metal atom and surrounding species is called co-ordination compounds .The branch of inorganic chemistry which deals with hte study of preparation properties of coordination compound is called co-ordination chemistry.

 K4[Fe(CN)6],    [CuNH3)4]SO4




1.Coordination compounds

Coordination compounds are compoundin which a central metal atom or ion  is linked to a

number of ions or neutral molecules bcoordinate bonds or which contain complex ions. Examples- K4[Fe(CN)6]; [ Cu(NH3)4]SO4; Ni(CO)4


2.The main postulates of Werners theory of coordination compounds


i) In coordination compoundmetalshow two types of linkages or valencies- Primary and Secondary.

iiThe primary valencies are ionisable and are satisfied bnegative ions.

iiiThe secondary valencies are non- ionisable and are satisfied bneutral molecules or negative ionsThe secondary valence is equal to the C.N and is fixed for a metal.

iv) The ions or groups bound bsecondarlinkages to the metal have characteristispatial arrangements corresponding to different coordination nos.

3.Difference between a double salt and a complex


Both double salts as well as complexes are formed by the combination of two or more stablcompounds in stoichiometriratio. However, double salts such as carnallite, KCl.MgCl2.6H2O, Mohrsalt, FeSO4.(NH4)2SO4.6H2O, potash alumKAl(SO4)2.12H2O, etc. dissociate into simplions completely when dissolved in waterHowever, complex ionsuch as [Fe(CN)6]4 of K4[Fe(CN)6] do not dissociate into Fe2+ and CN  ions.




 (i) Coordination entity It constitutes the central metal ion or atom bonded to a fixed number of ions or molecules represented within a square bracket.


(ii) Central atom/ ion: In a coordination entity, the atom/ion to which a fixed number of ions/groups are bound in a definite geometrical  arrangement around it, is called the central atom or ion.


iii) Ligands: The neutral or negative ions bound to the central metal or ion in the coordination entityThese donate a pair/s of electrons to the central metal atom /ion. Ligands may be classified as-


a)  Monodentate/Unidentate: Ligands bound to the central metal atom/ion through single donor atom. Ex- Cl-  ; H2O ; NH3  NO2-.


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