Question

Amongst the following identify the species with an atom in + 6 oxidation state:

• A. MnO₄^-
• B. Cr(CN)₆^3-
• C. NiF₆^2-
• D. CrO₂Cl₂

Answer 1

The correct option is D

CrO₂Cl₂

In $Mn{O}_4^{-}$, Mn is in +7 oxidation state.

Likewise, in $Cr(CN{)}_6^{3-}$ Chromium exhibits +3 oxidation state.

As for $Ni{F}_6^{2-}$, Nickel shows +4 oxidation state.

What will be the oxidation number of Cr in $Cr{O}_{2}C{l}_2$?
We apply the rules for assigning oxidation number:
$x-4-2=0$
$Solving,x=+6$