Question

The oxidation state of chromium in chromium trioxide is

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

Answer: (A)

3

Answer 2

Oxidation state of $Cr$ in $Cr _{2} O _{3}$ is $Cr _{2} O _{3}$
$2 x +(-2) 3=0$
$2 x-6=0$
$2 x=6$
$x= +3$