Plz explain.q.23 . How to determine whether central.atom show 4.or 6 oxidation number

Plz explain.q.23 . How to determine whether central.atom show 4.or 6 oxidation number GO 40

Dear student
Please find the solution to the asked query:
Metal ion complex with ammonia Geometry
Ni2+ [Ni(NH3)6]2+ Octahedral
Pt2+ [Pt(NH3)4]2+ Square planar
Zn2+ [Zn(NH3)4]2+ Tetrahedral

Hence option A is correct.
 
[To know whether the complex formed will be tetrahedral, octahedral or square planar, we need to take the ions and ligands into consideration, then the splitting diagram is formed to know how many electrons will pair up under the influence of the ligands, this will give the hybridisation and hence the geometry.
You will study these in details in higher classes ]
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