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Q.

Which one of the following oxides of nitrogen dimerises into a colourless solid/liquid on cooling

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a

$N_{2} O$

b

$N O$

c

$N_{2} O_{3}$

d

${NO}_{2}$

answer is D.

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Detailed Solution

$\underset{(Brown)}{2 {NO}_{2}} \underset{heating}{\overset{cooling}{\to}} \underset{(Colourless)}{N_{2} O_{4}}$

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