(iv) Geometrical (cis-, trans-) isomers can exist 5 4 The ionisation isomers dissolve in water to yield different ions and thus react
differently to various reagents:
[Co(NH3)5Br]SO4
+ Ba
2+ ® BaSO4 (s)
[Co(NH3)5SO4]Br
+ Ba
2+ ® No reaction
[Co(NH3)5Br]SO4
+ Ag
+ ® No reaction
[Co(NH3)5SO4]Br
+ Ag
+ ® AgBr (s)
5 6 In Ni(CO)4, Ni is in zero oxidation state whereas in NiCl4
2–, it is in +2 oxidation
state