# Which of the following oxides of nitrogen is anhydride of $HNO_3$ ?

$\begin {array} {1 1} (a)\;N_2O_3 & \quad (b)\;N_2O_4 \\ (c)\;N_2O_5 & \quad (d)\;N_2O \end {array}$

$(c)\;N_2O_5$