(B) Let the oxidation number of $Pt$ be $x$.In the complex ion $[PtCl_6]^{2-}$,the oxidation number of each $Cl$ atom is $-1$.The sum of oxidation num

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(B) Let the oxidation number of $Pt$ be $x$.In the complex ion $[PtCl_6]^{2-}$,the oxidation number of each $Cl$ atom is $-1$.The sum of oxidation numbers of all atoms in the complex ion is equal to its charge:$x + (6 \times -1) = -2$$x - 6 = -2$$x = -2 + 6$$x = +4$Therefore,the oxidation number of $Pt$ is $+4$.