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  4. 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

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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

NTA AbhyasNTA Abhyas 2020The p-Block Elements - Part2

Solution:

$NO_{2}$ is paramagnetic because of unpaired electron. On cooling $NO_{2}$ 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, $N_{2}O_{4}$ .