Question

The oxidation number of oxygen is -1 in

• A. $NO_2$
• B. $PbO_2$
• C. $Na_2O_2$
• D. $MnO_2$

Answer 1

Answer: (C)

$Na_2O_2$

Answer 2

The oxidation number of oxygen in most of the compounds is -2 except in peroxides(-1), superoxides (-1/2), oxygendifluoride (+ 2).