Oxidation number of chromium in chromyl chloride is

Let x be the oxidation state of Cr in ${\mathrm{CrO}}_2{\mathrm{Cl}}_2$

x+2(−2)−2=0
or, x= +6
The oxidation state of $\mathrm{Cr}$ in chromyl chloride is +6.

Chromyl chloride is the inorganic compound. It is a reddish brown chemical that is a volatile liquid at ambient temperature, which is rare for transition metal complexes.