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State why a yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.

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State why a yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.

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It turns yellow because cone. HNO3 decomposes by the action of sunlight to give brown coloured NO2.

The brown coloured NO2 dissolves in cone. HNO3 , to give it a yellow colour. 

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