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Question

What is the oxidation number of the central metal atom in the coordination compound [Pt(NH3)3Cl]Cl?


A
1
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B
0
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C
+1
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D
+2
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Solution

The correct option is C +2
Firstly, the overall (addition of all) oxidation state of a neutral compound must be zero. In [Pt(NH3)3Cl]Cl, the central metal atom is the Platinum(Pt). 

[Pt(NH3)3Cl]Cl, ionises into [Pt(NH3)3Cl]+ and Cl

Let us consider the oxidation state of Pt in this compound to be x. We know that ammonia is a neutal ligand and Chlorine is a monodentate ligand which has a unit negative charge. 

 [x +(3×0)1] = 1
      x = +2

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