p-Block elementsHard

Question

Which of the following oxides of nitrogen is solid at or below 273 K ?

Options

A.NO2
B.N2O3
C.N2O
D.N2O5

Solution

N2O5 exists as colourless solid below 273 K. Above this temperature it starts decomposing.
N2O5 → 2NO2 + 1/2 O2 

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