The IUPAC name of the complex $[Pt {({NH}_{3})}_{2} {Cl}_{2}]$ is

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diammine dichlorido platinum (II)

bis (ammino) dichloro platinum (IV)

platinum (II) diammino dichloride

dichloro diammine platinum (II)

answer is B.

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Detailed Solution

The ligands are ammonia (NH₃), and chloride.
Here, ammonia is neutral ligand.
So, it will be written as ammine, whereas chloride is an anion, so it will be written as chloride (ide to –o).
In this complex, there are two ammine ligands, so the greek prefix di- will be added before the ammine while naming the complex i.e. diammine.
Now, the central metal present in the complex is a cation, it is named the same as the element i.e. platinum.
We will calculate the oxidation state of platinum in the complex.
we know that charge of ammine ligand is 0, and the chlorine has -1 charge.
So, let us consider the oxidation state of platinum to be x.
The oxidation state can be written as: x + 2 (0) + 2(-1) = 0;
Here, we get x = 2, as the complex is neutral as mentioned.
Thus, in this complex we have the oxidation state of platinum is +2.
Now, we will write alphabetically, then it will be diamminedichloridoplatinum (II).

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