Question

The number of electrons required to balance the following equation are
$N{O}_3^{-}+4H^{+}+e^{-}⟶2H_{2}O+NO$

• A. $5$
• B. $4$
• C. $3$
• D. $2$

Answer 1

The correct option is C $3$

The given reaction is a redox reaction since here the oxidation state of $N$ in $N{O}_3^{-}$ is $+5$ and in $NO$ the oxidation state of $N$ is $+2$. Since oxidation state of $N$ is changing by 3 units, thus the number of electrons required to balance the equation is $3$.