Chemistry
State what is observed when nitric acid is kept in a reagent bottle for a long time.
Nitric Acid
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Answer
When nitric acid is kept in a reagent bottle for a long time, it turns dark yellowish brown in colour.
This is because nitric acid is unstable hence, it decomposes slightly even at ordinary temperatures and in the presence of sunlight. When it is kept for a long time, the decomposition is complete resulting in the formation of reddish brown nitrogen dioxide [NO2] that dissolves in the acid giving it a darker yellowish brown colour.
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