A gaseous compound of nitrogen and oxygen is paramagnetic in nature. When it is cooled below 0° C its molecular mass increases and paramagnetism is lost. The behaviour is reversed on heating. The compound is

Question

A gaseous compound of nitrogen and oxygen is paramagnetic in nature. When it is cooled below 0° C its molecular mass increases and paramagnetism is lost. The behaviour is reversed on heating. The compound is (A) N2O3 (B) N2O (C) NO2 (D) N2O4

Tardigrade Admin · Accepted Answer

NO2 is paramagnetic because of unpaired electron. On cooling NO2 below 0° C , it dimerises to N2O4 which does not have any unpaired electrons. Hence, no paramagnetism is show by the dimer, N2O4 .

Q. A gaseous compound of nitrogen and oxygen is paramagnetic in nature. When it is cooled below $0^{\circ} C$ its molecular mass increases and paramagnetism is lost. The behaviour is reversed on heating. The compound is

$N_{2} O_{3}$

$N_{2} O$

$N O_{2}$

$N_{2} O_{4}$

$N O_{2}$ is paramagnetic because of unpaired electron. On cooling $N O_{2}$ below $0^{\circ} C$ , it dimerises to $N_{2} O_{4}$ which does not have any unpaired electrons. Hence, no paramagnetism is show by the dimer, $N_{2} O_{4}$ .

Q. A gaseous compound of nitrogen and oxygen is paramagnetic in nature. When it is cooled below 0∘C its molecular mass increases and paramagnetism is lost. The behaviour is reversed on heating. The compound is

N2​O3​

N2​O

NO2​

N2​O4​