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Concentrated nitric acid appears yellow ...

Concentrated nitric acid appears yellow when it is left standing in a glass bottle. Explain ?

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Concentrated nitric acid appears yellow, when it is left for a while in a glass bottle because Nitric acid has tendency to decompose slowly in presence of sunlight and produce nitrogen dioxide gas, which reddish brown in colour. This liberated `NO_(2)` gas dissolves in nitric acid and gives it a yellowish colour.
`4HNO_(3) to 4NO_(2) +2H_(2)O +O_(2)`
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