Which one of the following compounds is chromium(III) oxide?
Cr2O3Cr_2O_3Cr2O3
CrO3CrO_3CrO3
Cr3O2Cr_3O_2Cr3O2
Cr3OCr_3OCr3O
(A) Cr2O3Cr_2O_3Cr2O3
Explanation: