Which of the following oxides of nitrogen is a coloured gas?

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N₂O₅

NO₂

$N_{2} O$

answer is D.

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Detailed Solution

Oxides of nitrogen contain oxygen and nitrogen atoms. There are different types of nitrogen oxides depending upon the mole ratio of O and N.

N₂O is nitrous oxide where the mole ratio of N and O is 2:1. It is also known as a laughing gas. It is a colorless gas with a pleasant smell.
NO is nitric oxide where the mole ratio of N and O is 1:1. It is a colorless gas.
N₂O₅ is dinitrogen pentoxide where the mole ratio of N and O is 2:5. It exists in white crystalline form.
NO₂ is nitrogen dioxide where the mole ratio of N and O is 1:2. This gas has a brown color and it is heavier than air.

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