Question

Which acts both an oxidizing as well as reducing agent?

• A. $HN{O}_3$
• B. $HN{O}_2$
• C. $H_{2}S{O}_4$
• D. $HCl$

Answer 1

The correct option is B $HN{O}_2$

$HN{O}_3$ oxidation number of $N$ is $=$ +5
Highest O.N., only reduces, acid only oxidising agent.
$HN{O}_2$ oxidation number $=$ +3
It reduces as well as oxidise, act both oxidising and reducing agent.
$H_{2}S{O}_4$ oxidation number $=$ +6
Highest O.N., only reduces, act only oxidising agent.
So $HN{O}_2$ acts both an oxidising as well as reducing agent