Question

What is the oxidation number of platinum in ptcl2(nh3)2?

Answer 1

Now, charge on Cl = -2, NH3 = 0, therefore, -2 charge on Cl and +2 charge on the coordination sphere is balanced by +4 charge on Pt.Thus, the oxidation state of Pt is +4



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Answer 2

The oxidation number of Platinum is +2.

Explanation:

A coordination complex consists of a central metal atom or ion bonded to ligands by coordinate covalent bonds. The ligands and the central metal together form the coordination sphere.

In $PtCl_2(NH_3)_2$, coordination sphere consists of 2 chloro ligands with charge of -1 each and ammine ligands with zero charge. The coordination sphere carries no charge as the the coordination compound is electrically neutral.

Let the oxidation state of Pt = x

∴ x +2(-1)+2(0) = 0

x= +2

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