3 Indicate the types of isomerism exhibited by the following complexes and
draw the structures for these isomers:
(i) K[Cr(H2O)2(C2O4)2
(ii) [Co(en)3]Cl3
(iii) [Co(NH3)5(NO2)](NO3)2
(iv) [Pt(NH3)(H2O)Cl2]
5 4 Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5(SO4)]Cl are ionisation
isomers Rationalised 2023-24
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Coordination Compounds
It is usually possible to predict the geometry of a complex from
the knowledge of its
magnetic behaviour on
the basis of the valence
bond theory In the diamagnetic
octahedral 
complex,
[Co(NH3)6]
3+, the cobalt ion
is in +3 oxidation state
and has the electronic
configuration 3d
6