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Concentrated ...

Question

Concentrated $H N O_{3}$ turns yellow in sunlight. Explain.

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Solution

Nitric acid ${H N O}_{3}$ , also known as aqua fortis and spirit of niter, is a highly corrosive mineral acid. The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water.
Conc. ${H N O}_{3}$ turns yellow in sunlight due to decomposition into oxides of nitrogen and water.

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