Question

In which one of the following compounds does oxygen have an oxidation number of $+2$?

• A. $F_{2}O$
• B. $C{l}_{2}O$
• C. $N{a}_2{O}_2$
• D. $N{a}_{2}O$

Answer 1

The correct option is A $F_{2}O$

Flourine is more electronegative than oxygen which in turn is more electronegative than Cl and Na.
The oxidation number of oxygen in $F_{2}O,C{l}_{2}O,N{a}_2{O}_2$ and $N{a}_{2}O$ are $+2,-2,-1$ and $-2$ respectively.