Amongst the following, identify the species with an atom in $+6$ oxidation state:
- $\left[\mathrm{MnO}_{4}ight]^{-}$
- $\left[\mathrm{Cr}(\mathrm{CN})_{6}ight]^{3-}$
- $\left[\mathrm{Ni}\mathrm{F}_{6}ight]^{2-}$
- $\mathrm{CrO}_{2} \mathrm{Cl}_{2}$
Solution
Let $\mathrm{O}$. No. of $\mathrm{Cr}=x$
$\therefore \quad x+2(-2)+2(-1)=0$
$x-4-2=0$
$\therefore \quad x=+6$ ^
Asked in: JEE-TOPICTESTS-CHEMISTRY