Q. Which of the following oxides of nitrogen is solid?
AFMCAFMC 2004
Solution:
Oxides of Nitrogen
Formula and name
Oxidation no. of $N$
physical appearance
Method of preparation
$N_2O$ (Nitrous oxide laughing gas)
+ 1
colourless gas
$NH_4NO_3 \xrightarrow{\Delta} N_2O + 2H_2O$
$NO$ (Nitric oxide)
+2
colourless gas
$4NH_3 + 5O_2 \rightarrow 4NO + 6H_2O$
$N_2O_3$ (dinitrogen trioxide)
+ 3
Blue solid
$NO(g) + NO_2(g)\xrightarrow{-20^{\circ}C} N_2O_3$
$N_2O_4$ (dinitrogen tetraoxide)
+4
colourless liquid
$2 NO _{2} \stackrel{0^{\circ} C }{\rightleftharpoons} N _{2} O _{4}$
$NO_2$ nitrogen dioxide
+ 4
Brown gas
$2Pb (NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2$
$N_2O_5$ dinitrogen pentoxide
+5
colourless gas
$4HNO_3 + P_4O_{10} \rightarrow 2N_2O_5 + 4HPO_3$
| Formula and name | Oxidation no. of $N$ | physical appearance | Method of preparation |
|---|---|---|---|
| $N_2O$ (Nitrous oxide laughing gas) | + 1 | colourless gas | $NH_4NO_3 \xrightarrow{\Delta} N_2O + 2H_2O$ |
| $NO$ (Nitric oxide) | +2 | colourless gas | $4NH_3 + 5O_2 \rightarrow 4NO + 6H_2O$ |
| $N_2O_3$ (dinitrogen trioxide) | + 3 | Blue solid | $NO(g) + NO_2(g)\xrightarrow{-20^{\circ}C} N_2O_3$ |
| $N_2O_4$ (dinitrogen tetraoxide) | +4 | colourless liquid | $2 NO _{2} \stackrel{0^{\circ} C }{\rightleftharpoons} N _{2} O _{4}$ |
| $NO_2$ nitrogen dioxide | + 4 | Brown gas | $2Pb (NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2$ |
| $N_2O_5$ dinitrogen pentoxide | +5 | colourless gas | $4HNO_3 + P_4O_{10} \rightarrow 2N_2O_5 + 4HPO_3$ |