# What is the oxidation state of Cl in HClO_2?

Jun 23, 2016

The sum of the oxidation numbers equals ZERO for a neutral molecule. For chlorous acid $O {N}_{\text{chlorine}} = + I I I$

#### Explanation:

And thus $0 = O {N}_{\text{hydrogen"+ON_"oxygen"+ON_"chlorine}}$

i.e., $0 = + I - 2 \times \left(- I I\right) + O {N}_{\text{chlorine}}$

$O {N}_{\text{chlorine}} = + I I I$

What is the oxidation number of $C l$ in perchloric acid, $H C l {O}_{4}$, in chloric acid, $H C l {O}_{3}$?