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N2O3 is a pale blue solid. Above its melting point of -100 0C it dissociates

N2O3 <-> NO + NO2

At low temperatures the liquid is quite an intense blue but fades to a greenish colur due to the presence of NO2.

Brown monomeric NO2 is in equilibrium with its dimeric form colourless N2O4

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Q: Why the pale blue liquid of N2O3 loses its colour on warming?
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