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Co-ordination number of platinum in [Pt(NH_(3))_(4)Cl_(2)]^(2+) ion is :

In metal carbonyls, there is synergic bonding interaction between metal and carbon monoxide. This leads to increase in strength of metal ligands bond and decrease in bond order of CO in carbonyl complex as compared to bond order in carbon monoxide. Simple carbonyls are invariably spin-paired complexes except for vanadium metal. Which one of the following metal carbonyl involves the d^(2)sp^(3) hybridization for the formation of metal-carbon sigma" "bonds and is paramagnetic ?

Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. 1 . Aqueous solutions of on addition of excess of concentrated HCl turns blue due to the formation of