Question

Write the formula for an oxoacid of nitrogen with $N$ in the oxidation state $+3$.

• A. ${HNO}_2$
• B. ${H_{2}NO}_2$
• C. ${HNO}_3$
• D. $HNO$

Answer 1

The correct option is A ${HNO}_2$

The formula for an oxoacid of nitrogen with $N$ in the oxidation state $+3$ is $HN{O}_2$.
The oxoacid is nitrous acid. The oxidation numbers of $H$ and $O$ are $+1$ and $-2$ respectively. Hence, the oxidation number of nitrogen is $+3$.
The oxidation number of $N$ in $H_{2}N{O}_2,HN{O}_3$ and $HNO$ is $+2$, $+5$ and $+1$ respectively.