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Nitric Acid

"Anhydrous ...

Question

"Anhydrous $H N O_{3}$ is colourless but it is often yellow in colour due to photochemical decomposition."
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Solution

Anhydrous $H N O_{3}$ is colourless but it is often yellow in colour due to $N O_{2}$ formed by photochemical decomposition.
Photochemical decomposition (in sunlight) takes place as follows:
$2 H N O_{3} h v \to H_{2} O + 2 N O_{2} + \frac{1}{2} O_{2}$

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