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Q.
$[Pt(NH_{3})_{4}] [CuCl_{4}]$ and $[Cu(NH_{3})_{4}] [PtCl_{4}]$ are known as
Coordination Compounds
Solution:
Different complex ions have the same molecular formula. Ligands are interchanged between the complex cation and complex anion. These type of complexes are called coordination isomers.
In $\left[ Pt \left( NH _{3}\right)_{4}\right]\left[ CuCl _{4}\right]$, ammonia ligands are attached to $Pt$ metal and chloride ligands are attached to Cu metal.
In $\left[ Cu \left( NH _{3}\right)_{4}\right]\left[ P t Cl _{4}\right]$, ammonia ligands are attached to Cu metal and chloride ligands are attached to P t metal.