# Which of the following two oxide of nitrogen have 30.5% nitrogen

$\begin{array}{1 1}(a)\;NO&(b)\;NO_2\;and\; N_2O_4\\(c)\;N_2O_2&(d)\;N_2O_5\end{array}$

% of nitrogen in $NO_2=\large\frac{14}{46}$$\times 100 \qquad\qquad\qquad\qquad=30.5% % of nitrogen in N_2O_4=\large\frac{28}{92}$$\times 100$
$\qquad\qquad\qquad\qquad$=30.5%
Hence (b) is the correct answer.