Question

Oxidation state of oxygen in ${CrO}_5$ is

• A. -1
• B. -2
• C. Both (1) & (2)
• D. $-\frac{1}{2}$

Answer 1

The correct option is A -1

Oxidation state of oxygen in $Cr{O}_5$ is $-1$ and $-2$ because in it and normal oxygen

The oxidation state of peroxy oxygen atom is $-1$ because it forms two bonds but uts one bond is itself with another oxygen atom, which we don't consider for calculating oxidation state, we consider only the bond with other atom for calculating oxidation state