Question

# $\text{N}{{\text{H}}_{3}}$is oxidised to NO by ${{\text{O}}_{2}}$ in basic medium. Number of equivalents of $\text{N}{{\text{H}}_{3}}$oxidised by 1 mole of ${{\text{O}}_{2}}$ is:A. 4B. 5 C. 6D. 7

Hint: Oxidised reagents are those reagents which itself gets reduced but oxidises the other molecule. Whereas reducing agents are those reagents which itself gets oxidised but reduces the other molecule.

$\text{4N}{{\text{H}}_{3}}\text{ + 5}{{\text{O}}_{2}}\text{ }\to \text{ 4NO + 6}{{\text{H}}_{2}}\text{O}$
\begin{align}& \left( 3\text{ }\cdot \text{ 4} \right)\text{ - }\left( \text{2 }\cdot \text{ 4} \right)\text{ = 12 - 8} \\ & \text{= 4} \\ \end{align}