Chemistry
State why a yellow colour appears in conc. nitric acid when left standing in an ordinary glass bottle.
Nitric Acid
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Answer
Pure nitric acid [HNO3] is colourless and unstable and decomposes slightly even at ordinary temperatures and in the presence of sunlight. The decomposition results in formation of reddish brown nitrogen dioxide [NO2] which remains dissolved in the acid thus imparting a slight yellowish brown colour.
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