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  4. The oxidation number of platinum in [Pt( C 2 H 4) Cl 3]-is:

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Q. The oxidation number of platinum in $\left[Pt\left( C _{2} H _{4}\right) Cl _{3}\right]^{-}$is:

J & K CETJ & K CET 2000

Solution:

Let the oxidation state of Pt is $x$ in $\left[ Pt \left( C _{2} H _{4}\right) Cl _{3}\right]^{-}$
$x+0+3(-1)=-1 $
$x+0-3=-1$
$x=+2$