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Explain the Following: Concentrated Nitric Add Appears Yellow When It is Left Standing in a Glass Bottle. - Chemistry

Explain the following:

Concentrated nitric add appears yellow when it is left standing in a glass bottle.

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Solution

Although pure concentrated nitric acid is colorless, it appears yellow when left standing in a glass bottle due to the dissolution of reddish brown nitrogen dioxide gas in the acid. Nitrogen dioxide is produced because of the thermal decomposition of a portion of nitric acid.

4HNO3 → 2H2O + 4NO2 + O2

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