Question

The oxidation number of $Pt$ in $[Pt(C_2{H}_4)C{l}_3{]}^{-}$ is

• A. $+1$
• B. $+2$
• C. $+3$
• D. $+4$

Answer 1

Answer: (B)

$[\underset{x}{\mathrm{Pt}}(\underset{0}{C_2{H}_4})\underset{-1}{C{l}_3}{]}^{-}$
$x+0+3(-1)=-1,x-3=-1,x=+2.$